




'''simple docstring'''



# flake8: noqa
# Lint as: python3
UpperCamelCase_    	=				[
    "VerificationMode",
    "Version",
    "disable_progress_bar",
    "enable_progress_bar",
    "is_progress_bar_enabled",
    "experimental",
]

from .info_utils import VerificationMode
from .logging import disable_progress_bar, enable_progress_bar, is_progress_bar_enabled
from .version import Version
from .experimental import experimental









import tensorflow as tf

from ...tf_utils import shape_list
class     UpperCamelCase__					(     tf.keras.layers.Layer				):






		'''simple docstring'''






		def __init__(							self,   snake_case__,   snake_case__,   snake_case__,   snake_case__,   snake_case__=1,   snake_case__=False,   **snake_case__  )       -> Optional[int]:






									"""simple docstring"""
									super().__init__(**snake_case__  )

									lowercase_	:   Tuple  				=     vocab_size
									lowercase_	:   Union[str, Any]  				=     d_embed
									lowercase_	:   Optional[Any]  				=     d_proj

									lowercase_	:   Optional[Any]  				=     cutoffs + [vocab_size]
									lowercase_	:   Optional[int]  				=     [0] + self.cutoffs
									lowercase_	:   Union[str, Any]  				=     div_val

									lowercase_	:   Union[str, Any]  				=     self.cutoffs[0]
									lowercase_	:   List[str]  				=     len(self.cutoffs  ) - 1
									lowercase_	:   List[str]  				=     self.shortlist_size + self.n_clusters
									lowercase_	:   Tuple  				=     keep_order

									lowercase_	:   Dict  				=     []
									lowercase_	:   int  				=     []






		def 						snake_case__				(							self,   snake_case__  )       -> Optional[int]:






									"""simple docstring"""
									if self.n_clusters > 0:
																lowercase_	:   List[str]  				=     self.add_weight(
																    shape=(self.n_clusters, self.d_embed),   initializer="""zeros""",   trainable=snake_case__,   name="""cluster_weight"""  )
																lowercase_	:   List[Any]  				=     self.add_weight(
																    shape=(self.n_clusters,),   initializer="""zeros""",   trainable=snake_case__,   name="""cluster_bias"""  )

									if self.div_val == 1:
																for i in range(len(self.cutoffs  )  ):
																							if self.d_proj != self.d_embed:
																														lowercase_	:   Any  				=     self.add_weight(
																														    shape=(self.d_embed, self.d_proj),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_projs_._{i}""",   )
																														self.out_projs.append(snake_case__  )
																							else:
																														self.out_projs.append(snake_case__  )
																							lowercase_	:   List[str]  				=     self.add_weight(
																							    shape=(self.vocab_size, self.d_embed),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_layers_._{i}_._weight""",   )
																							lowercase_	:   List[str]  				=     self.add_weight(
																							    shape=(self.vocab_size,),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_layers_._{i}_._bias""",   )
																							self.out_layers.append((weight, bias)  )
									else:
																for i in range(len(self.cutoffs  )  ):
																							lowercase_				,		lowercase_	:   Optional[Any]  				=     self.cutoff_ends[i], self.cutoff_ends[i + 1]
																							lowercase_	:   Union[str, Any]  				=     self.d_embed // (self.div_val**i)

																							lowercase_	:   int  				=     self.add_weight(
																							    shape=(d_emb_i, self.d_proj),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_projs_._{i}"""  )
																							self.out_projs.append(snake_case__  )
																							lowercase_	:   Any  				=     self.add_weight(
																							    shape=(r_idx - l_idx, d_emb_i),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_layers_._{i}_._weight""",   )
																							lowercase_	:   Tuple  				=     self.add_weight(
																							    shape=(r_idx - l_idx,),   initializer="""zeros""",   trainable=snake_case__,   name=f"""out_layers_._{i}_._bias""",   )
																							self.out_layers.append((weight, bias)  )
									super().build(snake_case__  )






		@staticmethod
		def 						snake_case__				(							snake_case__,   snake_case__,   snake_case__,   snake_case__=None  )       -> Optional[Any]:






									"""simple docstring"""
									lowercase_	:   Dict  				=     x
									if proj is not None:
																lowercase_	:   List[Any]  				=     tf.einsum("""ibd,ed->ibe""",   snake_case__,   snake_case__  )
									return tf.einsum("""ibd,nd->ibn""",   snake_case__,   snake_case__  ) + b






		@staticmethod
		def 						snake_case__				(							snake_case__,   snake_case__  )       -> List[str]:






									"""simple docstring"""
									lowercase_	:   Optional[int]  				=     shape_list(snake_case__  )
									lowercase_	:   Optional[Any]  				=     tf.range(lp_size[0],   dtype=target.dtype  )
									lowercase_	:   str  				=     tf.stack([r, target],   1  )
									return tf.gather_nd(snake_case__,   snake_case__  )






		def 						snake_case__				(							self,   snake_case__,   snake_case__,   snake_case__=True,   snake_case__=False  )       -> Dict:






									"""simple docstring"""
									lowercase_	:   Any  				=     0
									if self.n_clusters == 0:
																lowercase_	:   Union[str, Any]  				=     self._logit(snake_case__,   self.out_layers[0][0],   self.out_layers[0][1],   self.out_projs[0]  )
																if target is not None:
																							lowercase_	:   str  				=     tf.nn.sparse_softmax_cross_entropy_with_logits(labels=snake_case__,   logits=snake_case__  )
																lowercase_	:   Optional[int]  				=     tf.nn.log_softmax(snake_case__,   axis=-1  )
									else:
																lowercase_	:   int  				=     shape_list(snake_case__  )
																lowercase_	:   List[Any]  				=     []
																lowercase_	:   Tuple  				=     tf.zeros(hidden_sizes[:2]  )
																for i in range(len(self.cutoffs  )  ):
																							lowercase_				,		lowercase_	:   Optional[int]  				=     self.cutoff_ends[i], self.cutoff_ends[i + 1]
																							if target is not None:
																														lowercase_	:   Tuple  				=     (target >= l_idx) & (target < r_idx)
																														lowercase_	:   Union[str, Any]  				=     tf.where(snake_case__  )
																														lowercase_	:   Optional[Any]  				=     tf.boolean_mask(snake_case__,   snake_case__  ) - l_idx

																							if self.div_val == 1:
																														lowercase_	:   Optional[Any]  				=     self.out_layers[0][0][l_idx:r_idx]
																														lowercase_	:   Union[str, Any]  				=     self.out_layers[0][1][l_idx:r_idx]
																							else:
																														lowercase_	:   Dict  				=     self.out_layers[i][0]
																														lowercase_	:   int  				=     self.out_layers[i][1]

																							if i == 0:
																														lowercase_	:   Optional[int]  				=     tf.concat([cur_W, self.cluster_weight],   0  )
																														lowercase_	:   Optional[Any]  				=     tf.concat([cur_b, self.cluster_bias],   0  )

																														lowercase_	:   List[str]  				=     self._logit(snake_case__,   snake_case__,   snake_case__,   self.out_projs[0]  )
																														lowercase_	:   List[str]  				=     tf.nn.log_softmax(snake_case__  )
																														out.append(head_logprob[..., : self.cutoffs[0]]  )
																														if target is not None:
																																					lowercase_	:   int  				=     tf.boolean_mask(snake_case__,   snake_case__  )
																																					lowercase_	:   Optional[int]  				=     self._gather_logprob(snake_case__,   snake_case__  )
																							else:
																														lowercase_	:   List[str]  				=     self._logit(snake_case__,   snake_case__,   snake_case__,   self.out_projs[i]  )
																														lowercase_	:   Dict  				=     tf.nn.log_softmax(snake_case__  )
																														lowercase_	:   Optional[int]  				=     self.cutoffs[0] + i - 1  # No probability for the head cluster
																														lowercase_	:   int  				=     head_logprob[..., cluster_prob_idx, None] + tail_logprob
																														out.append(snake_case__  )
																														if target is not None:
																																					lowercase_	:   Optional[Any]  				=     tf.boolean_mask(snake_case__,   snake_case__  )
																																					lowercase_	:   Optional[int]  				=     tf.boolean_mask(snake_case__,   snake_case__  )
																																					lowercase_	:   Union[str, Any]  				=     self._gather_logprob(snake_case__,   snake_case__  )
																																					cur_logprob += cur_head_logprob[:, self.cutoff_ends[1] + i - 1]
																							if target is not None:
																														loss += tf.scatter_nd(snake_case__,   -cur_logprob,   shape_list(snake_case__  )  )
																lowercase_	:   List[str]  				=     tf.concat(snake_case__,   axis=-1  )

									if target is not None:
																if return_mean:
																							lowercase_	:   Tuple  				=     tf.reduce_mean(snake_case__  )
																# Add the training-time loss value to the layer using `self.add_loss()`.
																self.add_loss(snake_case__  )

																# Log the loss as a metric (we could log arbitrary metrics,
																# including different metrics for training and inference.
																self.add_metric(snake_case__,   name=self.name,   aggregation="""mean""" if return_mean else """"""  )

									return out