code: # coding=utf-8
  # Copyright 2018 The HuggingFace Inc. team, Microsoft Corporation.
  # Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """ TF 2.0 MPNet model. """
  
  
  import math
  
  import tensorflow as tf
  
  from ...activations_tf import get_tf_activation
  from ...file_utils import (
      MULTIPLE_CHOICE_DUMMY_INPUTS,
      add_code_sample_docstrings,
      add_start_docstrings,
      add_start_docstrings_to_model_forward,
  )
  from ...modeling_tf_outputs import (
      TFBaseModelOutput,
      TFBaseModelOutputWithPooling,
      TFMaskedLMOutput,
      TFMultipleChoiceModelOutput,
      TFQuestionAnsweringModelOutput,
      TFSequenceClassifierOutput,
      TFTokenClassifierOutput,
  )
  from ...modeling_tf_utils import (
      TFMaskedLanguageModelingLoss,
      TFMultipleChoiceLoss,
      TFPreTrainedModel,
      TFQuestionAnsweringLoss,
      TFSequenceClassificationLoss,
      TFTokenClassificationLoss,
      get_initializer,
      input_processing,
      keras_serializable,
      shape_list,
  )
  from ...utils import logging
  from .configuration_mpnet import MPNetConfig
  
  
  logger = logging.get_logger(__name__)
  
  _CONFIG_FOR_DOC = "MPNetConfig"
  _TOKENIZER_FOR_DOC = "MPNetTokenizer"
  
  TF_MPNET_PRETRAINED_MODEL_ARCHIVE_LIST = [
      "microsoft/mpnet-base",
  ]
  
  
  class TFMPNetPreTrainedModel(TFPreTrainedModel):
      """
      An abstract class to handle weights initialization and a simple interface for downloading and loading pretrained
      models.
      """
  
      config_class = MPNetConfig
      base_model_prefix = "mpnet"
  
  
  class TFMPNetEmbeddings(tf.keras.layers.Layer):
      """Construct the embeddings from word, position embeddings."""
  
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.padding_idx = 1
          self.vocab_size = config.vocab_size
          self.hidden_size = config.hidden_size
          self.initializer_range = config.initializer_range
  
          self.position_embeddings = tf.keras.layers.Embedding(
              config.max_position_embeddings,
              config.hidden_size,
              embeddings_initializer=get_initializer(self.initializer_range),
              name="position_embeddings",
          )
  
          # self.LayerNorm is not snake-cased to stick with TensorFlow model variable name and be able to load
          # any TensorFlow checkpoint file
          self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name="LayerNorm")
          self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
  
      def build(self, input_shape):
          """Build shared word embedding layer"""
          with tf.name_scope("word_embeddings"):
              # Create and initialize weights. The random normal initializer was chosen
              # arbitrarily, and works well.
              self.word_embeddings = self.add_weight(
                  "weight",
                  shape=[self.vocab_size, self.hidden_size],
                  initializer=get_initializer(self.initializer_range),
              )
  
          super().build(input_shape)
  
      def create_position_ids_from_input_ids(self, x):
          """
          Replace non-padding symbols with their position numbers. Position numbers begin at padding_idx+1. Padding
          symbols are ignored. This is modified from fairseq's `utils.make_positions`. :param tf.Tensor x: :return
          tf.Tensor:
          """
          mask = tf.cast(tf.math.not_equal(x, self.padding_idx), dtype=tf.int32)
          incremental_indicies = tf.math.cumsum(mask, axis=1) * mask
  
          return incremental_indicies + self.padding_idx
  
      def create_position_ids_from_inputs_embeds(self, inputs_embeds):
          """
          We are provided embeddings directly. We cannot infer which are padded so just generate sequential position ids.
          :param tf.Tensor inputs_embeds: :return tf.Tensor:
          """
          seq_length = shape_list(inputs_embeds)[1]
          position_ids = tf.range(self.padding_idx + 1, seq_length + self.padding_idx + 1, dtype=tf.int32)[tf.newaxis, :]
  
          return position_ids
  
      def call(
          self,
          input_ids=None,
          position_ids=None,
          token_type_ids=None,
          inputs_embeds=None,
          mode="embedding",
          training=False,
      ):
          """
          Get token embeddings of inputs
  
          Args:
              inputs: list of three int64 tensors with shape [batch_size, length]: (input_ids, position_ids, token_type_ids)
              mode: string, a valid value is one of "embedding" and "linear"
  
          Returns:
              outputs: (1) If mode == "embedding", output embedding tensor, float32 with shape [batch_size, length,
              embedding_size]; (2) mode == "linear", output linear tensor, float32 with shape [batch_size, length,
              vocab_size]
  
          Raises:
              ValueError: if mode is not valid. Shared weights logic adapted from
              https://github.com/tensorflow/models/blob/a009f4fb9d2fc4949e32192a944688925ef78659/official/transformer/v2/embedding_layer.py#L24
          """
          if mode == "embedding":
              return self._embedding(input_ids, position_ids, token_type_ids, inputs_embeds, training=training)
          elif mode == "linear":
              return self._linear(input_ids)
          else:
              raise ValueError("mode {} is not valid.".format(mode))
  
      def _embedding(self, input_ids, position_ids, token_type_ids, inputs_embeds, training=False):
          """Applies embedding based on inputs tensor."""
          assert not (input_ids is None and inputs_embeds is None)
  
          if position_ids is None:
              if input_ids is not None:
                  # Create the position ids from the input token ids. Any padded tokens remain padded.
                  position_ids = self.create_position_ids_from_input_ids(input_ids)
              else:
                  position_ids = self.create_position_ids_from_inputs_embeds(inputs_embeds)
  
          assert position_ids is None or len(position_ids.shape) <= 2
  
          if input_ids is not None:
              input_shape = shape_list(input_ids)
          else:
              input_shape = shape_list(inputs_embeds)[:-1]
  
          seq_length = input_shape[1]
  
          if position_ids is None:
              position_ids = tf.range(seq_length, dtype=tf.int32)[tf.newaxis, :]
  
          if inputs_embeds is None:
              inputs_embeds = tf.gather(self.word_embeddings, input_ids)
  
          position_embeddings = tf.cast(self.position_embeddings(position_ids), inputs_embeds.dtype)
          embeddings = inputs_embeds + position_embeddings
          embeddings = self.LayerNorm(embeddings)
          embeddings = self.dropout(embeddings, training=training)
  
          return embeddings
  
      def _linear(self, inputs):
          """
          Computes logits by running inputs through a linear layer
  
          Args:
              inputs: A float32 tensor with shape [batch_size, length, hidden_size
  
          Returns:
              float32 tensor with shape [batch_size, length, vocab_size].
          """
          batch_size = shape_list(inputs)[0]
          length = shape_list(inputs)[1]
          x = tf.reshape(inputs, [-1, self.hidden_size])
          logits = tf.matmul(x, self.word_embeddings, transpose_b=True)
  
          return tf.reshape(logits, [batch_size, length, self.vocab_size])
  
  
  # Copied from transformers.models.bert.modeling_tf_bert.TFBertPooler
  class TFMPNetPooler(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.dense = tf.keras.layers.Dense(
              config.hidden_size,
              kernel_initializer=get_initializer(config.initializer_range),
              activation="tanh",
              name="dense",
          )
  
      def call(self, hidden_states):
          # We "pool" the model by simply taking the hidden state corresponding
          # to the first token.
          first_token_tensor = hidden_states[:, 0]
          pooled_output = self.dense(first_token_tensor)
  
          return pooled_output
  
  
  class TFMPNetSelfAttention(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          if config.hidden_size % config.num_attention_heads != 0:
              raise ValueError(
                  f"The hidden size ({config.hidden_size}) is not a multiple of the number "
                  f"of attention heads ({config.num_attention_heads})"
              )
  
          self.num_attention_heads = config.num_attention_heads
          self.attention_head_size = int(config.hidden_size / config.num_attention_heads)
          self.all_head_size = self.num_attention_heads * self.attention_head_size
          self.q = tf.keras.layers.experimental.EinsumDense(
              equation="abc,cde->abde",
              output_shape=(None, config.num_attention_heads, self.attention_head_size),
              bias_axes="de",
              kernel_initializer=get_initializer(initializer_range=config.initializer_range),
              name="q",
          )
          self.k = tf.keras.layers.experimental.EinsumDense(
              equation="abc,cde->abde",
              output_shape=(None, config.num_attention_heads, self.attention_head_size),
              bias_axes="de",
              kernel_initializer=get_initializer(initializer_range=config.initializer_range),
              name="k",
          )
          self.v = tf.keras.layers.experimental.EinsumDense(
              equation="abc,cde->abde",
              output_shape=(None, config.num_attention_heads, self.attention_head_size),
              bias_axes="de",
              kernel_initializer=get_initializer(initializer_range=config.initializer_range),
              name="v",
          )
          self.o = tf.keras.layers.experimental.EinsumDense(
              equation="abcd,cde->abe",
              output_shape=(None, self.all_head_size),
              bias_axes="e",
              kernel_initializer=get_initializer(initializer_range=config.initializer_range),
              name="o",
          )
          self.dropout = tf.keras.layers.Dropout(config.attention_probs_dropout_prob)
  
      def call(self, hidden_states, attention_mask, head_mask, output_attentions, position_bias=None, training=False):
          q = self.q(hidden_states)
          k = self.k(hidden_states)
          v = self.v(hidden_states)
  
          dk = tf.cast(x=self.attention_head_size, dtype=q.dtype)
          q = tf.multiply(x=q, y=tf.math.rsqrt(x=dk))
          attention_scores = tf.einsum("aecd,abcd->acbe", k, q)
  
          # Apply relative position embedding (precomputed in MPNetEncoder) if provided.
          if position_bias is not None:
              attention_scores += position_bias
  
          if attention_mask is not None:
              # Apply the attention mask is (precomputed for all layers in TFMPNetModel call() function)
              attention_scores = attention_scores + attention_mask
  
          attention_probs = tf.nn.softmax(attention_scores, axis=-1)
  
          attention_probs = self.dropout(attention_probs, training=training)
  
          if head_mask is not None:
              attention_probs = attention_probs * head_mask
  
          c = tf.einsum("acbe,aecd->abcd", attention_probs, v)
          o = self.o(c)
  
          outputs = (o, attention_probs) if output_attentions else (o,)
          return outputs
  
  
  class TFMPNetAttention(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.attn = TFMPNetSelfAttention(config, name="attn")
          self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name="LayerNorm")
          self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
  
      def prune_heads(self, heads):
          raise NotImplementedError
  
      def call(self, input_tensor, attention_mask, head_mask, output_attentions, position_bias=None, training=False):
          self_outputs = self.attn(
              input_tensor, attention_mask, head_mask, output_attentions, position_bias=position_bias, training=training
          )
          attention_output = self.LayerNorm(self.dropout(self_outputs[0]) + input_tensor)
          outputs = (attention_output,) + self_outputs[1:]  # add attentions if we output them
          return outputs
  
  
  # Copied from transformers.models.bert.modeling_tf_bert.TFBertIntermediate
  class TFMPNetIntermediate(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.dense = tf.keras.layers.experimental.EinsumDense(
              equation="abc,cd->abd",
              output_shape=(None, config.intermediate_size),
              bias_axes="d",
              kernel_initializer=get_initializer(initializer_range=config.initializer_range),
              name="dense",
          )
  
          if isinstance(config.hidden_act, str):
              self.intermediate_act_fn = get_tf_activation(activation_string=config.hidden_act)
          else:
              self.intermediate_act_fn = config.hidden_act
  
      def call(self, hidden_states):
          hidden_states = self.dense(inputs=hidden_states)
          hidden_states = self.intermediate_act_fn(inputs=hidden_states)
  
          return hidden_states
  
  
  # Copied from transformers.models.bert.modeling_tf_bert.TFBertOutput
  class TFMPNetOutput(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.dense = tf.keras.layers.experimental.EinsumDense(
              equation="abc,cd->abd",
              bias_axes="d",
              output_shape=(None, config.hidden_size),
              kernel_initializer=get_initializer(config.initializer_range),
              name="dense",
          )
          self.LayerNorm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name="LayerNorm")
          self.dropout = tf.keras.layers.Dropout(rate=config.hidden_dropout_prob)
  
      def call(self, hidden_states, input_tensor, training=False):
          hidden_states = self.dense(inputs=hidden_states)
          hidden_states = self.dropout(inputs=hidden_states, training=training)
          hidden_states = self.LayerNorm(inputs=hidden_states + input_tensor)
  
          return hidden_states
  
  
  class TFMPNetLayer(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.attention = TFMPNetAttention(config, name="attention")
          self.intermediate = TFMPNetIntermediate(config, name="intermediate")
          self.out = TFMPNetOutput(config, name="output")
  
      def call(self, hidden_states, attention_mask, head_mask, output_attentions, position_bias=None, training=False):
          self_attention_outputs = self.attention(
              hidden_states, attention_mask, head_mask, output_attentions, position_bias=position_bias, training=training
          )
          attention_output = self_attention_outputs[0]
          outputs = self_attention_outputs[1:]  # add self attentions if we output attention weights
  
          intermediate_output = self.intermediate(attention_output)
          layer_output = self.out(intermediate_output, attention_output, training=training)
          outputs = (layer_output,) + outputs  # add attentions if we output them
  
          return outputs
  
  
  class TFMPNetEncoder(tf.keras.layers.Layer):
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.config = config
          self.n_heads = config.num_attention_heads
          self.output_attentions = config.output_attentions
          self.output_hidden_states = config.output_hidden_states
  
          self.layer = [TFMPNetLayer(config, name="layer_._{}".format(i)) for i in range(config.num_hidden_layers)]
          self.relative_attention_bias = tf.keras.layers.Embedding(
              config.relative_attention_num_buckets,
              self.n_heads,
              name="relative_attention_bias",
          )
          self.relative_attention_num_buckets = config.relative_attention_num_buckets
  
      def call(
          self,
          hidden_states,
          attention_mask,
          head_mask,
          output_attentions,
          output_hidden_states,
          return_dict,
          training=False,
      ):
          position_bias = self.compute_position_bias(hidden_states)
          all_hidden_states = () if output_hidden_states else None
          all_attentions = () if output_attentions else None
  
          for i, layer_module in enumerate(self.layer):
              if output_hidden_states:
                  all_hidden_states = all_hidden_states + (hidden_states,)
  
              layer_outputs = layer_module(
                  hidden_states,
                  attention_mask,
                  head_mask[i],
                  output_attentions,
                  position_bias=position_bias,
                  training=training,
              )
              hidden_states = layer_outputs[0]
  
              if output_attentions:
                  all_attentions = all_attentions + (layer_outputs[1],)
  
          # Add last layer
          if output_hidden_states:
              all_hidden_states = all_hidden_states + (hidden_states,)
  
          if not return_dict:
              return tuple(v for v in [hidden_states, all_hidden_states, all_attentions] if v is not None)
  
          return TFBaseModelOutput(
              last_hidden_state=hidden_states, hidden_states=all_hidden_states, attentions=all_attentions
          )
  
      @staticmethod
      def _relative_position_bucket(relative_position, num_buckets=32, max_distance=128):
          ret = 0
          n = -relative_position
  
          num_buckets //= 2
          ret += tf.dtypes.cast(tf.math.less(n, 0), tf.int32) * num_buckets
          n = tf.math.abs(n)
  
          # now n is in the range [0, inf)
          max_exact = num_buckets // 2
          is_small = tf.math.less(n, max_exact)
  
          val_if_large = max_exact + tf.dtypes.cast(
              tf.math.log(tf.dtypes.cast(n, tf.float32) / max_exact)
              / math.log(max_distance / max_exact)
              * (num_buckets - max_exact),
              tf.int32,
          )
  
          val_if_large = tf.math.minimum(val_if_large, num_buckets - 1)
          ret += tf.where(is_small, n, val_if_large)
          return ret
  
      def compute_position_bias(self, x, position_ids=None):
          """ Compute binned relative position bias """
          input_shape = shape_list(x)
          qlen, klen = input_shape[1], input_shape[1]
  
          if position_ids is not None:
              context_position = position_ids[:, :, None]
              memory_position = position_ids[:, None, :]
          else:
              context_position = tf.range(qlen)[:, None]
              memory_position = tf.range(klen)[None, :]
  
          relative_position = memory_position - context_position  # shape (qlen, klen)
  
          rp_bucket = self._relative_position_bucket(
              relative_position,
              num_buckets=self.relative_attention_num_buckets,
          )
          values = self.relative_attention_bias(rp_bucket)  # shape (qlen, klen, num_heads)
          values = tf.expand_dims(tf.transpose(values, [2, 0, 1]), axis=0)  # shape (1, num_heads, qlen, klen)
          return values
  
  
  @keras_serializable
  class TFMPNetMainLayer(tf.keras.layers.Layer):
      config_class = MPNetConfig
  
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
  
          self.config = config
          self.num_hidden_layers = config.num_hidden_layers
          self.initializer_range = config.initializer_range
          self.output_attentions = config.output_attentions
          self.output_hidden_states = config.output_hidden_states
          self.return_dict = config.use_return_dict
          self.encoder = TFMPNetEncoder(config, name="encoder")
          self.pooler = TFMPNetPooler(config, name="pooler")
          # The embeddings must be the last declaration in order to follow the weights order
          self.embeddings = TFMPNetEmbeddings(config, name="embeddings")
  
      # Copied from transformers.models.bert.modeling_tf_bert.TFBertMainLayer.get_input_embeddings
      def get_input_embeddings(self):
          return self.embeddings
  
      # Copied from transformers.models.bert.modeling_tf_bert.TFBertMainLayer.set_input_embeddings
      def set_input_embeddings(self, value):
          self.embeddings.word_embeddings = value
          self.embeddings.vocab_size = value.shape[0]
  
      # Copied from transformers.models.bert.modeling_tf_bert.TFBertMainLayer._prune_heads
      def _prune_heads(self, heads_to_prune):
          """
          Prunes heads of the model. heads_to_prune: dict of {layer_num: list of heads to prune in this layer} See base
          class PreTrainedModel
          """
          raise NotImplementedError
  
      # Copied from transformers.models.bert.modeling_tf_bert.TFBertMainLayer.call
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          training=False,
          **kwargs,
      ):
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              training=training,
              kwargs_call=kwargs,
          )
          if inputs["input_ids"] is not None and inputs["inputs_embeds"] is not None:
              raise ValueError("You cannot specify both input_ids and inputs_embeds at the same time")
          elif inputs["input_ids"] is not None:
              input_shape = shape_list(inputs["input_ids"])
          elif inputs["inputs_embeds"] is not None:
              input_shape = shape_list(inputs["inputs_embeds"])[:-1]
          else:
              raise ValueError("You have to specify either input_ids or inputs_embeds")
  
          if inputs["attention_mask"] is None:
              inputs["attention_mask"] = tf.fill(input_shape, 1)
  
          if inputs["token_type_ids"] is None:
              inputs["token_type_ids"] = tf.fill(input_shape, 0)
  
          embedding_output = self.embeddings(
              inputs["input_ids"],
              inputs["position_ids"],
              inputs["token_type_ids"],
              inputs["inputs_embeds"],
              training=inputs["training"],
          )
  
          # We create a 3D attention mask from a 2D tensor mask.
          # Sizes are [batch_size, 1, 1, to_seq_length]
          # So we can broadcast to [batch_size, num_heads, from_seq_length, to_seq_length]
          # this attention mask is more simple than the triangular masking of causal attention
          # used in OpenAI GPT, we just need to prepare the broadcast dimension here.
          extended_attention_mask = inputs["attention_mask"][:, tf.newaxis, tf.newaxis, :]
  
          # Since attention_mask is 1.0 for positions we want to attend and 0.0 for
          # masked positions, this operation will create a tensor which is 0.0 for
          # positions we want to attend and -10000.0 for masked positions.
          # Since we are adding it to the raw scores before the softmax, this is
          # effectively the same as removing these entirely.
          extended_attention_mask = tf.cast(extended_attention_mask, embedding_output.dtype)
          extended_attention_mask = (1.0 - extended_attention_mask) * -10000.0
  
          # Prepare head mask if needed
          # 1.0 in head_mask indicate we keep the head
          # attention_probs has shape bsz x n_heads x N x N
          # input head_mask has shape [num_heads] or [num_hidden_layers x num_heads]
          # and head_mask is converted to shape [num_hidden_layers x batch x num_heads x seq_length x seq_length]
          if inputs["head_mask"] is not None:
              raise NotImplementedError
          else:
              inputs["head_mask"] = [None] * self.num_hidden_layers
  
          encoder_outputs = self.encoder(
              embedding_output,
              extended_attention_mask,
              inputs["head_mask"],
              inputs["output_attentions"],
              inputs["output_hidden_states"],
              inputs["return_dict"],
              training=inputs["training"],
          )
  
          sequence_output = encoder_outputs[0]
          pooled_output = self.pooler(sequence_output)
  
          if not inputs["return_dict"]:
              return (
                  sequence_output,
                  pooled_output,
              ) + encoder_outputs[1:]
  
          return TFBaseModelOutputWithPooling(
              last_hidden_state=sequence_output,
              pooler_output=pooled_output,
              hidden_states=encoder_outputs.hidden_states,
              attentions=encoder_outputs.attentions,
          )
  
  
  MPNET_START_DOCSTRING = r"""
  
      This model inherits from :class:`~transformers.TFPreTrainedModel`. Check the superclass documentation for the
      generic methods the library implements for all its model (such as downloading or saving, resizing the input
      embeddings, pruning heads etc.)
  
      This model is also a `tf.keras.Model <https://www.tensorflow.org/api_docs/python/tf/keras/Model>`__ subclass. Use
      it as a regular TF 2.0 Keras Model and refer to the TF 2.0 documentation for all matter related to general usage
      and behavior.
  
      .. note::
  
          TF 2.0 models accepts two formats as inputs:
  
          - having all inputs as keyword arguments (like PyTorch models), or
          - having all inputs as a list, tuple or dict in the first positional arguments.
  
          This second option is useful when using :meth:`tf.keras.Model.fit` method which currently requires having all
          the tensors in the first argument of the model call function: :obj:`model(inputs)`.
  
          If you choose this second option, there are three possibilities you can use to gather all the input Tensor in
          the first positional argument :
  
          - a single Tensor with :obj:`input_ids` only and nothing else: :obj:`model(inputs_ids)`
          - a list of varying length with one or several input Tensors IN THE ORDER given in the docstring:
            :obj:`model([input_ids, attention_mask])` or :obj:`model([input_ids, attention_mask, token_type_ids])`
          - a dictionary with one or several input Tensors associated to the input names given in the docstring:
            :obj:`model({"input_ids": input_ids, "token_type_ids": token_type_ids})`
  
      Args:
          config (:class:`~transformers.MPNetConfig`): Model configuration class with all the parameters of the model.
              Initializing with a config file does not load the weights associated with the model, only the
              configuration. Check out the :meth:`~transformers.PreTrainedModel.from_pretrained` method to load the model
              weights.
  """
  
  MPNET_INPUTS_DOCSTRING = r"""
      Args:
          input_ids (:obj:`Numpy array` or :obj:`tf.Tensor` of shape :obj:`({0})`):
              Indices of input sequence tokens in the vocabulary.
  
              Indices can be obtained using :class:`~transformers.MPNetTokenizer`. See
              :func:`transformers.PreTrainedTokenizer.__call__` and :func:`transformers.PreTrainedTokenizer.encode` for
              details.
  
              `What are input IDs? <../glossary.html#input-ids>`__
          attention_mask (:obj:`Numpy array` or :obj:`tf.Tensor` of shape :obj:`({0})`, `optional`):
              Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``:
  
              - 1 for tokens that are **not masked**,
              - 0 for tokens that are **masked**.
  
              `What are attention masks? <../glossary.html#attention-mask>`__
          token_type_ids (:obj:`Numpy array` or :obj:`tf.Tensor` of shape :obj:`({0})`, `optional`):
              Segment token indices to indicate first and second portions of the inputs. Indices are selected in ``[0,
              1]``:
  
              - 0 corresponds to a `sentence A` token,
              - 1 corresponds to a `sentence B` token.
  
              `What are token type IDs? <../glossary.html#token-type-ids>`__
          position_ids (:obj:`Numpy array` or :obj:`tf.Tensor` of shape :obj:`({0})`, `optional`):
              Indices of positions of each input sequence tokens in the position embeddings. Selected in the range ``[0,
              config.max_position_embeddings - 1]``.
  
              `What are position IDs? <../glossary.html#position-ids>`__
          head_mask (:obj:`Numpy array` or :obj:`tf.Tensor` of shape :obj:`(num_heads,)` or :obj:`(num_layers, num_heads)`, `optional`):
              Mask to nullify selected heads of the self-attention modules. Mask values selected in ``[0, 1]``:
  
              - 1 indicates the head is **not masked**,
              - 0 indicates the head is **masked**.
  
          inputs_embeds (:obj:`tf.Tensor` of shape :obj:`({0}, hidden_size)`, `optional`):
              Optionally, instead of passing :obj:`input_ids` you can choose to directly pass an embedded representation.
              This is useful if you want more control over how to convert :obj:`input_ids` indices into associated
              vectors than the model's internal embedding lookup matrix.
          output_attentions (:obj:`bool`, `optional`):
              Whether or not to return the attentions tensors of all attention layers. See ``attentions`` under returned
              tensors for more detail.
          output_hidden_states (:obj:`bool`, `optional`):
              Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for
              more detail.
          return_dict (:obj:`bool`, `optional`):
              Whether or not to return a :class:`~transformers.file_utils.ModelOutput` instead of a plain tuple.
          training (:obj:`bool`, `optional`, defaults to :obj:`False`):
              Whether or not to use the model in training mode (some modules like dropout modules have different
              behaviors between training and evaluation).
  """
  
  
  @add_start_docstrings(
      "The bare MPNet Model transformer outputing raw hidden-states without any specific head on top.",
      MPNET_START_DOCSTRING,
  )
  class TFMPNetModel(TFMPNetPreTrainedModel):
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFBaseModelOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          training=False,
          **kwargs,
      ):
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              training=training,
              kwargs_call=kwargs,
          )
          outputs = self.mpnet(
              input_ids=inputs["input_ids"],
              attention_mask=inputs["attention_mask"],
              token_type_ids=inputs["token_type_ids"],
              position_ids=inputs["position_ids"],
              head_mask=inputs["head_mask"],
              inputs_embeds=inputs["inputs_embeds"],
              output_attentions=inputs["output_attentions"],
              output_hidden_states=inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
          return outputs
  
  
  class TFMPNetLMHead(tf.keras.layers.Layer):
      """MPNet head for masked and permuted language modeling"""
  
      def __init__(self, config, input_embeddings, **kwargs):
          super().__init__(**kwargs)
  
          self.vocab_size = config.vocab_size
          self.dense = tf.keras.layers.Dense(
              config.hidden_size, kernel_initializer=get_initializer(config.initializer_range), name="dense"
          )
          self.layer_norm = tf.keras.layers.LayerNormalization(epsilon=config.layer_norm_eps, name="layer_norm")
          self.act = get_tf_activation("gelu")
  
          # The output weights are the same as the input embeddings, but there is
          # an output-only bias for each token.
          self.decoder = input_embeddings
  
      def build(self, input_shape):
          self.bias = self.add_weight(shape=(self.vocab_size,), initializer="zeros", trainable=True, name="bias")
  
          super().build(input_shape)
  
      def call(self, features):
          x = self.dense(features)
          x = self.act(x)
          x = self.layer_norm(x)
  
          # project back to size of vocabulary with bias
          x = self.decoder(x, mode="linear") + self.bias
  
          return x
  
  
  @add_start_docstrings("""MPNet Model with a `language modeling` head on top. """, MPNET_START_DOCSTRING)
  class TFMPNetForMaskedLM(TFMPNetPreTrainedModel, TFMaskedLanguageModelingLoss):
  
      _keys_to_ignore_on_load_missing = [r"pooler"]
  
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
  
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
          self.lm_head = TFMPNetLMHead(config, self.mpnet.embeddings, name="lm_head")
  
      def get_output_embeddings(self):
          return self.mpnet.embeddings
  
      def get_output_layer_with_bias(self):
          return self.lm_head
  
      def get_prefix_bias_name(self):
          return self.name + "/" + self.lm_head.name
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFMaskedLMOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          labels=None,
          training=False,
          **kwargs,
      ):
          r"""
          labels (:obj:`tf.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
              Labels for computing the masked language modeling loss. Indices should be in ``[-100, 0, ...,
              config.vocab_size]`` (see ``input_ids`` docstring) Tokens with indices set to ``-100`` are ignored
              (masked), the loss is only computed for the tokens with labels in ``[0, ..., config.vocab_size]``
          """
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              labels=labels,
              training=training,
              kwargs_call=kwargs,
          )
          outputs = self.mpnet(
              inputs["input_ids"],
              attention_mask=inputs["attention_mask"],
              token_type_ids=inputs["token_type_ids"],
              position_ids=inputs["position_ids"],
              head_mask=inputs["head_mask"],
              inputs_embeds=inputs["inputs_embeds"],
              output_attentions=inputs["output_attentions"],
              output_hidden_states=inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
          sequence_output = outputs[0]
          prediction_scores = self.lm_head(sequence_output)
  
          loss = None if inputs["labels"] is None else self.compute_loss(inputs["labels"], prediction_scores)
  
          if not inputs["return_dict"]:
              output = (prediction_scores,) + outputs[2:]
              return ((loss,) + output) if loss is not None else output
  
          return TFMaskedLMOutput(
              loss=loss,
              logits=prediction_scores,
              hidden_states=outputs.hidden_states,
              attentions=outputs.attentions,
          )
  
  
  class TFMPNetClassificationHead(tf.keras.layers.Layer):
      """Head for sentence-level classification tasks."""
  
      def __init__(self, config, **kwargs):
          super().__init__(**kwargs)
          self.dense = tf.keras.layers.Dense(
              config.hidden_size,
              kernel_initializer=get_initializer(config.initializer_range),
              activation="tanh",
              name="dense",
          )
          self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
          self.out_proj = tf.keras.layers.Dense(
              config.num_labels, kernel_initializer=get_initializer(config.initializer_range), name="out_proj"
          )
  
      def call(self, features, training=False):
          x = features[:, 0, :]  # take <s> token (equiv. to [CLS])
          x = self.dropout(x, training=training)
          x = self.dense(x)
          x = self.dropout(x, training=training)
          x = self.out_proj(x)
          return x
  
  
  @add_start_docstrings(
      """
      MPNet Model transformer with a sequence classification/regression head on top (a linear layer on top of the pooled
      output) e.g. for GLUE tasks.
      """,
      MPNET_START_DOCSTRING,
  )
  class TFMPNetForSequenceClassification(TFMPNetPreTrainedModel, TFSequenceClassificationLoss):
  
      _keys_to_ignore_on_load_missing = [r"pooler"]
  
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
          self.num_labels = config.num_labels
  
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
          self.classifier = TFMPNetClassificationHead(config, name="classifier")
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFSequenceClassifierOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          labels=None,
          training=False,
          **kwargs,
      ):
          r"""
          labels (:obj:`tf.Tensor` of shape :obj:`(batch_size,)`, `optional`):
              Labels for computing the sequence classification/regression loss. Indices should be in :obj:`[0, ...,
              config.num_labels - 1]`. If :obj:`config.num_labels == 1` a regression loss is computed (Mean-Square loss),
              If :obj:`config.num_labels > 1` a classification loss is computed (Cross-Entropy).
          """
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              labels=labels,
              training=training,
              kwargs_call=kwargs,
          )
          outputs = self.mpnet(
              inputs["input_ids"],
              attention_mask=inputs["attention_mask"],
              token_type_ids=inputs["token_type_ids"],
              position_ids=inputs["position_ids"],
              head_mask=inputs["head_mask"],
              inputs_embeds=inputs["inputs_embeds"],
              output_attentions=inputs["output_attentions"],
              output_hidden_states=inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
  
          sequence_output = outputs[0]
          logits = self.classifier(sequence_output, training=training)
  
          loss = None if inputs["labels"] is None else self.compute_loss(inputs["labels"], logits)
  
          if not inputs["return_dict"]:
              output = (logits,) + outputs[2:]
              return ((loss,) + output) if loss is not None else output
  
          return TFSequenceClassifierOutput(
              loss=loss,
              logits=logits,
              hidden_states=outputs.hidden_states,
              attentions=outputs.attentions,
          )
  
  
  @add_start_docstrings(
      """
      MPNet Model with a multiple choice classification head on top (a linear layer on top of the pooled output and a
      softmax) e.g. for RocStories/SWAG tasks.
      """,
      MPNET_START_DOCSTRING,
  )
  class TFMPNetForMultipleChoice(TFMPNetPreTrainedModel, TFMultipleChoiceLoss):
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
  
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
          self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
          self.classifier = tf.keras.layers.Dense(
              1, kernel_initializer=get_initializer(config.initializer_range), name="classifier"
          )
  
      @property
      def dummy_inputs(self):
          """
          Dummy inputs to build the network.
  
          Returns:
              tf.Tensor with dummy inputs
          """
          return {"input_ids": tf.constant(MULTIPLE_CHOICE_DUMMY_INPUTS)}
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, num_choices, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFMultipleChoiceModelOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          labels=None,
          training=False,
          **kwargs,
      ):
          r"""
          labels (:obj:`tf.Tensor` of shape :obj:`(batch_size,)`, `optional`):
              Labels for computing the multiple choice classification loss. Indices should be in ``[0, ...,
              num_choices]`` where :obj:`num_choices` is the size of the second dimension of the input tensors. (See
              :obj:`input_ids` above)
          """
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              labels=labels,
              training=training,
              kwargs_call=kwargs,
          )
  
          if inputs["input_ids"] is not None:
              num_choices = shape_list(inputs["input_ids"])[1]
              seq_length = shape_list(inputs["input_ids"])[2]
          else:
              num_choices = shape_list(inputs["inputs_embeds"])[1]
              seq_length = shape_list(inputs["inputs_embeds"])[2]
  
          flat_input_ids = tf.reshape(inputs["input_ids"], (-1, seq_length)) if inputs["input_ids"] is not None else None
          flat_attention_mask = (
              tf.reshape(inputs["attention_mask"], (-1, seq_length)) if inputs["attention_mask"] is not None else None
          )
          flat_token_type_ids = (
              tf.reshape(inputs["token_type_ids"], (-1, seq_length)) if inputs["token_type_ids"] is not None else None
          )
          flat_position_ids = (
              tf.reshape(inputs["position_ids"], (-1, seq_length)) if inputs["position_ids"] is not None else None
          )
          flat_inputs_embeds = (
              tf.reshape(inputs["inputs_embeds"], (-1, seq_length, shape_list(inputs["inputs_embeds"])[3]))
              if inputs["inputs_embeds"] is not None
              else None
          )
          outputs = self.mpnet(
              flat_input_ids,
              flat_attention_mask,
              flat_token_type_ids,
              flat_position_ids,
              inputs["head_mask"],
              flat_inputs_embeds,
              inputs["output_attentions"],
              inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
          pooled_output = outputs[1]
          pooled_output = self.dropout(pooled_output, training=inputs["training"])
          logits = self.classifier(pooled_output)
          reshaped_logits = tf.reshape(logits, (-1, num_choices))
          loss = None if inputs["labels"] is None else self.compute_loss(inputs["labels"], reshaped_logits)
  
          if not inputs["return_dict"]:
              output = (reshaped_logits,) + outputs[2:]
              return ((loss,) + output) if loss is not None else output
  
          return TFMultipleChoiceModelOutput(
              loss=loss,
              logits=reshaped_logits,
              hidden_states=outputs.hidden_states,
              attentions=outputs.attentions,
          )
  
  
  @add_start_docstrings(
      """
         MPNet Model with a token classification head on top (a linear layer on top of the hidden-states output) e.g. for
         Named-Entity-Recognition (NER) tasks.
         """,
      MPNET_START_DOCSTRING,
  )
  class TFMPNetForTokenClassification(TFMPNetPreTrainedModel, TFTokenClassificationLoss):
  
      _keys_to_ignore_on_load_missing = [r"pooler"]
  
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
  
          self.num_labels = config.num_labels
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
          self.dropout = tf.keras.layers.Dropout(config.hidden_dropout_prob)
          self.classifier = tf.keras.layers.Dense(
              config.num_labels, kernel_initializer=get_initializer(config.initializer_range), name="classifier"
          )
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFTokenClassifierOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          labels=None,
          training=False,
          **kwargs,
      ):
          r"""
          labels (:obj:`tf.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
              Labels for computing the token classification loss. Indices should be in ``[0, ..., config.num_labels -
              1]``.
          """
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              labels=labels,
              training=training,
              kwargs_call=kwargs,
          )
          outputs = self.mpnet(
              input_ids=inputs["input_ids"],
              attention_mask=inputs["attention_mask"],
              token_type_ids=inputs["token_type_ids"],
              position_ids=inputs["position_ids"],
              head_mask=inputs["head_mask"],
              inputs_embeds=inputs["inputs_embeds"],
              output_attentions=inputs["output_attentions"],
              output_hidden_states=inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
          sequence_output = outputs[0]
  
          sequence_output = self.dropout(sequence_output, training=inputs["training"])
          logits = self.classifier(sequence_output)
  
          loss = None if inputs["labels"] is None else self.compute_loss(inputs["labels"], logits)
  
          if not inputs["return_dict"]:
              output = (logits,) + outputs[1:]
              return ((loss,) + output) if loss is not None else output
  
          return TFTokenClassifierOutput(
              loss=loss,
              logits=logits,
              hidden_states=outputs.hidden_states,
              attentions=outputs.attentions,
          )
  
  
  @add_start_docstrings(
      """
      MPNet Model with a span classification head on top for extractive question-answering tasks like SQuAD (a linear
      layers on top of the hidden-states output to compute `span start logits` and `span end logits`).
      """,
      MPNET_START_DOCSTRING,
  )
  class TFMPNetForQuestionAnswering(TFMPNetPreTrainedModel, TFQuestionAnsweringLoss):
  
      _keys_to_ignore_on_load_missing = [r"pooler"]
  
      def __init__(self, config, *inputs, **kwargs):
          super().__init__(config, *inputs, **kwargs)
          self.num_labels = config.num_labels
  
          self.mpnet = TFMPNetMainLayer(config, name="mpnet")
          self.qa_outputs = tf.keras.layers.Dense(
              config.num_labels, kernel_initializer=get_initializer(config.initializer_range), name="qa_outputs"
          )
  
      @add_start_docstrings_to_model_forward(MPNET_INPUTS_DOCSTRING.format("batch_size, sequence_length"))
      @add_code_sample_docstrings(
          tokenizer_class=_TOKENIZER_FOR_DOC,
          checkpoint="microsoft/mpnet-base",
          output_type=TFQuestionAnsweringModelOutput,
          config_class=_CONFIG_FOR_DOC,
      )
      def call(
          self,
          input_ids=None,
          attention_mask=None,
          token_type_ids=None,
          position_ids=None,
          head_mask=None,
          inputs_embeds=None,
          output_attentions=None,
          output_hidden_states=None,
          return_dict=None,
          start_positions=None,
          end_positions=None,
          training=False,
          **kwargs,
      ):
          r"""
          start_positions (:obj:`tf.Tensor` of shape :obj:`(batch_size,)`, `optional`):
              Labels for position (index) of the start of the labelled span for computing the token classification loss.
              Positions are clamped to the length of the sequence (:obj:`sequence_length`). Position outside of the
              sequence are not taken into account for computing the loss.
          end_positions (:obj:`tf.Tensor` of shape :obj:`(batch_size,)`, `optional`):
              Labels for position (index) of the end of the labelled span for computing the token classification loss.
              Positions are clamped to the length of the sequence (:obj:`sequence_length`). Position outside of the
              sequence are not taken into account for computing the loss.
          """
          inputs = input_processing(
              func=self.call,
              config=self.config,
              input_ids=input_ids,
              attention_mask=attention_mask,
              token_type_ids=token_type_ids,
              position_ids=position_ids,
              head_mask=head_mask,
              inputs_embeds=inputs_embeds,
              output_attentions=output_attentions,
              output_hidden_states=output_hidden_states,
              return_dict=return_dict,
              start_positions=start_positions,
              end_positions=end_positions,
              training=training,
              kwargs_call=kwargs,
          )
          outputs = self.mpnet(
              inputs["input_ids"],
              attention_mask=inputs["attention_mask"],
              token_type_ids=inputs["token_type_ids"],
              position_ids=inputs["position_ids"],
              head_mask=inputs["head_mask"],
              inputs_embeds=inputs["inputs_embeds"],
              output_attentions=inputs["output_attentions"],
              output_hidden_states=inputs["output_hidden_states"],
              return_dict=inputs["return_dict"],
              training=inputs["training"],
          )
          sequence_output = outputs[0]
  
          logits = self.qa_outputs(sequence_output)
          start_logits, end_logits = tf.split(logits, 2, axis=-1)
          start_logits = tf.squeeze(start_logits, axis=-1)
          end_logits = tf.squeeze(end_logits, axis=-1)
          loss = None
  
          if inputs["start_positions"] is not None and inputs["end_positions"] is not None:
              labels = {"start_position": inputs["start_positions"]}
              labels["end_position"] = inputs["end_positions"]
              loss = self.compute_loss(labels, (start_logits, end_logits))
  
          if not inputs["return_dict"]:
              output = (start_logits, end_logits) + outputs[2:]
              return ((loss,) + output) if loss is not None else output
  
          return TFQuestionAnsweringModelOutput(
              loss=loss,
              start_logits=start_logits,
              end_logits=end_logits,
              hidden_states=outputs.hidden_states,
              attentions=outputs.attentions,
          )
  