# Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# See LICENSE for license information.

from functools import partial
from typing import Dict

import flax
import jax
import jax.numpy as jnp
from praxis import pax_fiddle
from praxis.base_layer import WeightInit, DEFAULT_INIT_MUTABLE_LIST
import pytest

from transformer_engine.common.recipe import DelayedScaling, Format
from transformer_engine.jax import fp8_autocast, update_fp8_metas, update_collections
from transformer_engine.jax.flax import DenseGeneral, LayerNormDenseGeneral
from transformer_engine.jax.flax import LayerNorm as flax_LayerNorm
from transformer_engine.jax.flax import LayerNormMLP as flax_LayerNormMLP
from transformer_engine.jax.flax import MultiHeadAttention as flax_MultiHeadAttention
from transformer_engine.jax.flax import RelativePositionBiases as flax_RelativePositionBiases
from transformer_engine.jax.flax import TransformerLayer as flax_TransformerLayer
from transformer_engine.jax.flax.module import Softmax
from transformer_engine.jax.fp8 import FP8Helper, is_fp8_available
from transformer_engine.jax.praxis import LayerNorm
from transformer_engine.jax.praxis import FusedSoftmax, LayerNorm
from transformer_engine.jax.praxis import LayerNormLinear, LayerNormMLP, Linear
from transformer_engine.jax.praxis import MultiHeadAttention, RelativePositionBiases
from transformer_engine.jax.praxis import TransformerEngineBaseLayer, TransformerLayer, TransformerLayerType
from transformer_engine.jax.softmax import SoftmaxType
from utils import assert_allclose

is_fp8_supported, reason = is_fp8_available()

DATA_SHAPE = [(128, 32, 512), (512, 32, 512)]
DTYPE = [jnp.float32, jnp.bfloat16]
ENABLE_FP8 = [False, True]
FP8_FORMATS = [Format.E4M3, Format.HYBRID]


def compare_dict(ref_fd, test_fd, rtol=1e-05, atol=1e-08):
    for key in ref_fd:
        assert key in test_fd, \
            f"{key} not found in test dict {test_fd}"
        assert isinstance(test_fd[key], type(ref_fd[key])), \
            f"The data type is not match between ref and test " \
            f" Dict on {key=}"
        if isinstance(ref_fd[key], Dict):
            compare_dict(ref_fd[key], test_fd[key], rtol, atol)
        else:
            assert_allclose(ref_fd[key],
                            test_fd[key],
                            rtol=rtol,
                            atol=atol,
                            err_msg=f"{key=} is not close")


class TestLayer:

    @staticmethod
    def loss(inner_variables, *inner_inputs, module, mean_out=True):
        outs = module.apply(inner_variables, *inner_inputs)
        out = outs
        if isinstance(outs, tuple):
            # The first place of outs is the real output, others
            # are auxiliary values.
            out = outs[0]
        return jnp.mean(out) if mean_out else out

    @staticmethod
    def loss_and_grads(module, variables, *inputs):
        grad_fn = jax.value_and_grad(TestLayer.loss, argnums=(0, 1))
        loss_val, (wgrads, dgrad) = grad_fn(variables, *inputs, module=module)
        if FP8Helper.is_fp8_enabled():
            wgrads = update_fp8_metas(wgrads)
        return loss_val, wgrads, dgrad

    def input_getter(self, shape, dtype):
        raise NotImplementedError

    def get_layer_name(self):
        raise NotImplementedError

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        raise NotImplementedError

    def sync_variables(self, praxis_variables, flax_variables):
        synced_praxis_variables = praxis_variables

        lyr_name = self.get_layer_name()

        synced_praxis_variables['params'][lyr_name]['cld'] = \
            flax.core.unfreeze(flax_variables['params'])

        return synced_praxis_variables, flax_variables

    def sync_wgrads(self, praxis_wgrads, flax_wgrads):
        synced_praxis_grads = praxis_wgrads

        lyr_name = self.get_layer_name()

        synced_praxis_grads['params'] = \
            synced_praxis_grads['params'][lyr_name]['cld']

        if FP8Helper.is_fp8_enabled():
            synced_praxis_grads[FP8Helper.FP8_COLLECTION_NAME] = \
                synced_praxis_grads[FP8Helper.FP8_COLLECTION_NAME][lyr_name]['cld']

        return synced_praxis_grads, flax.core.unfreeze(flax_wgrads)

    def forward_backward_runner(self,
                                data_shape,
                                dtype,
                                praxis_p,
                                flax_cls,
                                rtol=1e-05,
                                atol=1e-08):
        init_key = jax.random.PRNGKey(seed=1234)

        test_inputs = self.input_getter(data_shape, dtype)

        praxis_layer = praxis_p.Instantiate()
        # This is a workaround to correctly enable FP8 meta generation for Praxis.
        # TODO (Ming Huang): To come out a better solution.
        mutable_list = DEFAULT_INIT_MUTABLE_LIST + [FP8Helper.FP8_COLLECTION_NAME]
        praxis_variables = praxis_layer.init(init_key, *test_inputs, mutable=mutable_list)

        flax_layer = flax_cls()
        flax_variables = flax_layer.init(init_key, *test_inputs)
        if "params_axes" in flax_variables:
            flax_variables, _ = flax.core.pop(flax_variables, "params_axes")
        if FP8Helper.is_fp8_enabled():
            flax_variables, _ = flax.core.pop(flax_variables,
                                              FP8Helper.FP8_COLLECTION_NAME + "_axes")

        praxis_variables, flax_variables = self.sync_variables(praxis_variables, flax_variables)

        iter_times = 5 if FP8Helper.is_fp8_enabled() else 1

        for _ in range(iter_times):
            praxis_loss, praxis_wgrads, praxis_dgrad = \
                TestLayer.loss_and_grads(praxis_layer, praxis_variables, *test_inputs)
            flax_loss, flax_wgrads, flax_dgrad = \
                TestLayer.loss_and_grads(flax_layer, flax_variables, *test_inputs)
            if FP8Helper.is_fp8_enabled():
                praxis_wgrads.pop('params')
                praxis_variables = update_collections(praxis_wgrads, praxis_variables)
                flax_wgrads, _ = flax.core.pop(flax_wgrads, 'params')
                flax_variables = update_collections(flax_wgrads, flax_variables)

        praxis_loss, praxis_wgrads, praxis_dgrad = \
                TestLayer.loss_and_grads(praxis_layer, praxis_variables, *test_inputs)
        flax_loss, flax_wgrads, flax_dgrad = \
            TestLayer.loss_and_grads(flax_layer, flax_variables, *test_inputs)

        assert_allclose(praxis_loss, flax_loss, rtol=rtol, atol=atol)
        assert_allclose(praxis_dgrad, flax_dgrad, rtol=rtol, atol=atol)

        praxis_wgrads, flax_wgrads = self.sync_wgrads(praxis_wgrads, flax_wgrads)
        compare_dict(praxis_wgrads, flax_wgrads, rtol=rtol, atol=atol)


class LayerNormAttr:
    LN_TYPE = 'layernorm_type'
    ZERO_CEN = 'zero_centered_gamma'
    ATTRS = [{
        LN_TYPE: "layernorm",
        ZERO_CEN: False
    }, {
        LN_TYPE: "layernorm",
        ZERO_CEN: True
    }, {
        LN_TYPE: "rmsnorm",
        ZERO_CEN: False
    }]


class TestLayerNorm(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape, dtype),)

    def get_layer_name(self):
        return 'layer_norm'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        layernorm_type = attrs[LayerNormAttr.LN_TYPE]
        zero_centered_gamma = attrs[LayerNormAttr.ZERO_CEN]
        scale_init = None
        bias_init = WeightInit.Constant(0.0)
        transpose_batch_sequence = False

        praxis_p = pax_fiddle.Config(LayerNorm,
                                     name='layer_norm',
                                     dtype=dtype,
                                     layernorm_type=layernorm_type,
                                     zero_centered_gamma=zero_centered_gamma,
                                     scale_init=scale_init,
                                     bias_init=bias_init,
                                     transpose_batch_sequence=transpose_batch_sequence)
        flax_cls = partial(flax_LayerNorm,
                           layernorm_type=layernorm_type,
                           zero_centered_gamma=zero_centered_gamma,
                           scale_init=scale_init,
                           bias_init=TransformerEngineBaseLayer.generate_params_init(
                               "ln_bias", bias_init),
                           dtype=dtype,
                           transpose_batch_sequence=transpose_batch_sequence)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LayerNormAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class FusedSoftmaxAttr:
    SCALE_FACTOR = 'scale_factor'
    ST_TYPE = 'softmax_type'
    ATTRS = [{
        SCALE_FACTOR: 0.0,
        ST_TYPE: SoftmaxType.SCALED
    }, {
        SCALE_FACTOR: 0.0,
        ST_TYPE: SoftmaxType.SCALED_MASKED
    }, {
        SCALE_FACTOR: 0.0,
        ST_TYPE: SoftmaxType.SCALED_UPPER_TRIANG_MASKED
    }]


class TestFusedSoftmax(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return jax.random.normal(data_key, shape, dtype), \
               jnp.ones(shape, dtype=jnp.uint8) # Masks

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        scale_factor = attrs[FusedSoftmaxAttr.SCALE_FACTOR]
        softmax_type = attrs[FusedSoftmaxAttr.ST_TYPE]

        praxis_p = pax_fiddle.Config(FusedSoftmax,
                                     name='fused_softmax',
                                     scale_factor=scale_factor,
                                     softmax_type=softmax_type)
        flax_cls = partial(Softmax, scale_factor=scale_factor, softmax_type=softmax_type)

        return praxis_p, flax_cls

    def sync_variables(self, praxis_variables, flax_variables):
        return praxis_variables, flax_variables

    def sync_wgrads(self, praxis_wgrads, flax_wgrads):
        return praxis_wgrads, flax_wgrads

    @pytest.mark.parametrize('data_shape', [(32, 1, 128, 128), (32, 1, 512, 128)])
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', FusedSoftmaxAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        if (attrs[FusedSoftmaxAttr.ST_TYPE] == SoftmaxType.SCALED_UPPER_TRIANG_MASKED) and \
            (data_shape[-2] != data_shape[-1]):
            pass    # Skip, due to not support
        else:
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class LinearAttr:
    FEATURE = 'features'
    USE_BIAS = 'use_bias'
    ATTRS = [{
        FEATURE: 512,
        USE_BIAS: False
    }, {
        FEATURE: 512,
        USE_BIAS: True
    }, {
        FEATURE: 1024,
        USE_BIAS: False
    }, {
        FEATURE: 1024,
        USE_BIAS: True
    }]


class TestLinear(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape, dtype),)

    def get_layer_name(self):
        return 'linear'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        out_features = attrs[LinearAttr.FEATURE]
        kernel_init = WeightInit.Gaussian(1.0)
        use_bias = attrs[LinearAttr.USE_BIAS]
        bias_init = WeightInit.Constant(0.0)
        axis = -1
        transpose_batch_sequence = False

        praxis_p = pax_fiddle.Config(Linear,
                                     name='linear',
                                     dtype=dtype,
                                     out_features=out_features,
                                     params_init=kernel_init,
                                     use_bias=use_bias,
                                     bias_init=bias_init,
                                     axis=axis,
                                     transpose_batch_sequence=transpose_batch_sequence)
        flax_cls = partial(
            DenseGeneral,
            features=out_features,
            kernel_init=TransformerEngineBaseLayer.generate_params_init("kernel", kernel_init),
            use_bias=use_bias,
            bias_init=TransformerEngineBaseLayer.generate_params_init("bias", bias_init),
            axis=axis,
            dtype=dtype,
            transpose_batch_sequence=transpose_batch_sequence)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LinearAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)

    @pytest.mark.skipif(not is_fp8_supported, reason=reason)
    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LinearAttr.ATTRS)
    @pytest.mark.parametrize('fp8_format', FP8_FORMATS)
    def test_forward_backward_fp8(self,
                                  data_shape,
                                  dtype,
                                  attrs,
                                  fp8_format,
                                  rtol=1e-05,
                                  atol=1e-08):

        ds = DelayedScaling(fp8_format=fp8_format)
        with fp8_autocast(enabled=True, fp8_recipe=ds):
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class LayerNormLinearAttr:
    FEATURE = 'features'
    USE_BIAS = 'use_bias'
    ENABLE_LN = 'enable_layernorm'
    LN_TYPE = 'layernorm_type'
    ZERO_CEN = 'zero_centered_gamma'
    ATTRS = [{
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False
    }, {
        FEATURE: 512,
        USE_BIAS: True,
        ENABLE_LN: False,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False
    }]


class TestLayerNormLinear(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape, dtype),)

    def get_layer_name(self):
        return 'ln_linear'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        out_features = attrs[LayerNormLinearAttr.FEATURE]
        enable_layernorm = attrs[LayerNormLinearAttr.ENABLE_LN]
        layernorm_type = attrs[LayerNormLinearAttr.LN_TYPE]
        zero_centered_gamma = attrs[LayerNormLinearAttr.ZERO_CEN]
        kernel_init = WeightInit.Gaussian(1.0)
        use_bias = attrs[LayerNormLinearAttr.USE_BIAS]
        bias_init = WeightInit.Constant(0.0)
        axis = -1
        transpose_batch_sequence = False

        praxis_p = pax_fiddle.Config(LayerNormLinear,
                                     name='ln_linear',
                                     dtype=dtype,
                                     out_features=out_features,
                                     enable_layernorm=enable_layernorm,
                                     layernorm_type=layernorm_type,
                                     zero_centered_gamma=zero_centered_gamma,
                                     params_init=kernel_init,
                                     use_bias=use_bias,
                                     bias_init=bias_init,
                                     axis=axis,
                                     transpose_batch_sequence=transpose_batch_sequence)
        flax_cls = partial(
            LayerNormDenseGeneral,
            features=out_features,
            enable_layernorm=enable_layernorm,
            layernorm_type=layernorm_type,
            zero_centered_gamma=zero_centered_gamma,
            kernel_init=TransformerEngineBaseLayer.generate_params_init("kernel", kernel_init),
            use_bias=use_bias,
            bias_init=TransformerEngineBaseLayer.generate_params_init("bias", bias_init),
            axis=axis,
            dtype=dtype,
            transpose_batch_sequence=transpose_batch_sequence)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LayerNormLinearAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)

    @pytest.mark.skipif(not is_fp8_supported, reason=reason)
    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LayerNormLinearAttr.ATTRS)
    @pytest.mark.parametrize('fp8_format', FP8_FORMATS)
    def test_forward_backward_fp8(self,
                                  data_shape,
                                  dtype,
                                  attrs,
                                  fp8_format,
                                  rtol=1e-05,
                                  atol=1e-08):

        ds = DelayedScaling(fp8_format=fp8_format)
        with fp8_autocast(enabled=True, fp8_recipe=ds):
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class LayerNormMLPAttr:
    INTERMEDIATE_DIM = 'intermediate_dim'
    USE_BIAS = 'use_bias'
    ENABLE_LN = 'enable_layernorm'
    LN_TYPE = 'layernorm_type'
    ZERO_CEN = 'zero_centered_gamma'
    ACTIVATION = 'activations'
    ATTRS = [{
        INTERMEDIATE_DIM: 2048,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',)
    }, {
        INTERMEDIATE_DIM: 2048,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ACTIVATION: ('relu',)
    }, {
        INTERMEDIATE_DIM: 2048,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',)
    }, {
        INTERMEDIATE_DIM: 2048,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear')
    }, {
        INTERMEDIATE_DIM: 2048,
        USE_BIAS: True,
        ENABLE_LN: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear')
    }]


class TestLayerNormMLP(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape, dtype),)

    def get_layer_name(self):
        return 'ln_mlp'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        intermediate_dim = attrs[LayerNormMLPAttr.INTERMEDIATE_DIM]
        enable_layernorm = attrs[LayerNormMLPAttr.ENABLE_LN]
        layernorm_type = attrs[LayerNormMLPAttr.LN_TYPE]
        zero_centered_gamma = attrs[LayerNormMLPAttr.ZERO_CEN]
        kernel_init = WeightInit.Gaussian(1.0)
        use_bias = attrs[LayerNormMLPAttr.USE_BIAS]
        bias_init = WeightInit.Constant(0.0)
        activations = attrs[LayerNormMLPAttr.ACTIVATION]
        axis = -1
        transpose_batch_sequence = False

        praxis_p = pax_fiddle.Config(LayerNormMLP,
                                     name='ln_mlp',
                                     dtype=dtype,
                                     intermediate_dim=intermediate_dim,
                                     enable_layernorm=enable_layernorm,
                                     layernorm_type=layernorm_type,
                                     zero_centered_gamma=zero_centered_gamma,
                                     params_init=kernel_init,
                                     use_bias=use_bias,
                                     bias_init=bias_init,
                                     activations=activations,
                                     intermediate_dropout_rate=0.0,
                                     axis=axis,
                                     transpose_batch_sequence=transpose_batch_sequence)
        flax_cls = partial(
            flax_LayerNormMLP,
            intermediate_dim=intermediate_dim,
            enable_layernorm=enable_layernorm,
            layernorm_type=layernorm_type,
            zero_centered_gamma=zero_centered_gamma,
            kernel_init=TransformerEngineBaseLayer.generate_params_init("kernel", kernel_init),
            use_bias=use_bias,
            bias_init=TransformerEngineBaseLayer.generate_params_init("bias", bias_init),
            activations=activations,
            intermediate_dropout_rate=0.0,
            axis=axis,
            dtype=dtype,
            transpose_batch_sequence=transpose_batch_sequence)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LayerNormMLPAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)

    @pytest.mark.skipif(not is_fp8_supported, reason=reason)
    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', LayerNormMLPAttr.ATTRS)
    @pytest.mark.parametrize('fp8_format', FP8_FORMATS)
    def test_forward_backward_fp8(self,
                                  data_shape,
                                  dtype,
                                  attrs,
                                  fp8_format,
                                  rtol=1e-05,
                                  atol=1e-08):

        ds = DelayedScaling(fp8_format=fp8_format)
        with fp8_autocast(enabled=True, fp8_recipe=ds):
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class TestRelativePositionBias(TestLayer):

    def get_layer_name(self):
        return 'relative_position_bias'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        num_buckets = 32
        max_distance = 128
        num_attention_heads = 64
        rb_stddev = (num_attention_heads * num_buckets)**-0.5
        embedding_init = WeightInit.Gaussian(rb_stddev)

        praxis_p = pax_fiddle.Config(RelativePositionBiases,
                                     name='relative_position_bias',
                                     dtype=dtype,
                                     num_buckets=num_buckets,
                                     max_distance=max_distance,
                                     num_attention_heads=num_attention_heads,
                                     embedding_init=embedding_init)
        flax_cls = partial(flax_RelativePositionBiases,
                           num_buckets=num_buckets,
                           max_distance=max_distance,
                           num_attention_heads=num_attention_heads,
                           embedding_init=TransformerEngineBaseLayer.generate_params_init(
                               "rel_embedding", embedding_init),
                           dtype=dtype)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', [{}])
    def test_forward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)

        init_key = jax.random.PRNGKey(seed=1234)

        test_inputs = [(128, 128, True), (128, 128, False)]
        for test_input in test_inputs:
            praxis_layer = praxis_p.Instantiate()
            praxis_variables = praxis_layer.init(init_key, *test_input)

            flax_layer = flax_cls()
            flax_variables = flax_layer.init(init_key, *test_input)
            if "params_axes" in flax_variables:
                flax_variables, _ = flax.core.pop(flax_variables, "params_axes")
            if FP8Helper.is_fp8_enabled():
                flax_variables, _ = flax.core.pop(flax_variables,
                                                  FP8Helper.FP8_COLLECTION_NAME + "_axes")

            praxis_variables, flax_variables = self.sync_variables(praxis_variables, flax_variables)

            praxis_loss= \
                    TestLayer.loss(praxis_variables, *test_input, module=praxis_layer, mean_out=False)
            flax_loss = \
                TestLayer.loss(flax_variables, *test_input, module=flax_layer, mean_out=False)

            assert_allclose(praxis_loss, flax_loss, rtol=rtol, atol=atol)


class MultiHeadAttnAttr:
    USE_BIAS = 'use_bias'
    LN_TYPE = 'layernorm_type'
    ATTN_MASK_TYPE = 'attn_mask_type'
    ZERO_CEN = 'zero_centered_gamma'
    ATTRS = [{
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ATTN_MASK_TYPE: 'padding'
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ATTN_MASK_TYPE: 'padding'
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ATTN_MASK_TYPE: 'padding'
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ATTN_MASK_TYPE: 'causal'
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ATTN_MASK_TYPE: 'causal'
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ATTN_MASK_TYPE: 'causal'
    }]


class TestMultiHeadAttn(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape,
                                  dtype), jax.random.normal(data_key, shape, dtype))

    def get_layer_name(self):
        return 'multi_head_attn'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        head_dim = 64
        num_heads = 16
        layernorm_type = attrs[MultiHeadAttnAttr.LN_TYPE]
        zero_centered_gamma = attrs[MultiHeadAttnAttr.ZERO_CEN]
        kernel_init = WeightInit.Gaussian(1.0)
        use_bias = attrs[MultiHeadAttnAttr.USE_BIAS]
        bias_init = WeightInit.Constant(0.0)
        apply_residual_connection_post_layernorm = False
        output_layernorm = False
        attn_mask_type = attrs[MultiHeadAttnAttr.ATTN_MASK_TYPE]
        fuse_qkv: bool = True
        transpose_batch_sequence = True
        scale_attn_logits = False
        scaled_query_init = True
        float32_logits = False

        praxis_p = pax_fiddle.Config(
            MultiHeadAttention,
            name='mha',
            dtype=dtype,
            head_dim=head_dim,
            num_heads=num_heads,
            layernorm_type=layernorm_type,
            zero_centered_gamma=zero_centered_gamma,
            params_init=kernel_init,
            use_bias=use_bias,
            bias_init=bias_init,
            apply_residual_connection_post_layernorm=apply_residual_connection_post_layernorm,
            output_layernorm=output_layernorm,
            attn_mask_type=attn_mask_type,
            fuse_qkv=fuse_qkv,
            transpose_batch_sequence=transpose_batch_sequence,
            scale_attn_logits=scale_attn_logits,
            scaled_query_init=scaled_query_init,
            float32_logits=float32_logits)
        flax_cls = partial(
            flax_MultiHeadAttention,
            dtype=dtype,
            head_dim=head_dim,
            num_heads=num_heads,
            layernorm_type=layernorm_type,
            zero_centered_gamma=zero_centered_gamma,
            kernel_init=TransformerEngineBaseLayer.generate_params_init("kernel", kernel_init),
            use_bias=use_bias,
            bias_init=TransformerEngineBaseLayer.generate_params_init("bias", bias_init),
            apply_residual_connection_post_layernorm=apply_residual_connection_post_layernorm,
            output_layernorm=output_layernorm,
            attn_mask_type=attn_mask_type,
            fuse_qkv=fuse_qkv,
            transpose_batch_sequence=transpose_batch_sequence,
            scale_attn_logits=scale_attn_logits,
            scaled_query_init=scaled_query_init,
            float32_logits=float32_logits)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', MultiHeadAttnAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)

    @pytest.mark.skipif(not is_fp8_supported, reason=reason)
    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', MultiHeadAttnAttr.ATTRS)
    @pytest.mark.parametrize('fp8_format', FP8_FORMATS)
    def test_forward_backward_fp8(self,
                                  data_shape,
                                  dtype,
                                  attrs,
                                  fp8_format,
                                  rtol=1e-05,
                                  atol=1e-08):

        ds = DelayedScaling(fp8_format=fp8_format)
        with fp8_autocast(enabled=True, fp8_recipe=ds):
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)


class TransformerLayerAttr:
    USE_BIAS = 'use_bias'
    LN_TYPE = 'layernorm_type'
    ACTIVATION = 'activations'
    LYR_TYPE = 'layer_type'
    ZERO_CEN = 'zero_centered_gamma'
    TRANSPOSE_BS = 'transpose_batch_sequence'
    ATTRS = [{
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: True,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('relu',),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.ENCODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'layernorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: False
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: True
    }, {
        USE_BIAS: True,
        LN_TYPE: 'rmsnorm',
        ZERO_CEN: False,
        ACTIVATION: ('gelu', 'linear'),
        LYR_TYPE: TransformerLayerType.DECODER,
        TRANSPOSE_BS: False
    }]


class TestTransformer(TestLayer):

    def input_getter(self, shape, dtype):
        data_key = jax.random.PRNGKey(seed=1234)
        return (jax.random.normal(data_key, shape,
                                  dtype), jax.random.normal(data_key, shape, dtype))

    def get_layer_name(self):
        return 'transformerlayer'

    def generate_praxis_p_and_flax_cls(self, dtype, attrs):
        hidden_size = 512
        mlp_hidden_size = 2048
        num_attention_heads = 8
        layernorm_type = attrs[TransformerLayerAttr.LN_TYPE]
        hidden_dropout = 0.0
        attention_dropout = 0.0
        mlp_activations = attrs[TransformerLayerAttr.ACTIVATION]
        kernel_init = WeightInit.Gaussian(1.0)
        use_bias = attrs[TransformerLayerAttr.USE_BIAS]
        bias_init = WeightInit.Constant(0.0)
        layer_type = attrs[TransformerLayerAttr.LYR_TYPE]
        enable_relative_embedding = True
        relative_embedding = pax_fiddle.Config(RelativePositionBiases,
                                               num_attention_heads=num_attention_heads)
        drop_path = 0.0
        transpose_batch_sequence = attrs[TransformerLayerAttr.TRANSPOSE_BS]

        rel_embedding_init = RelativePositionBiases.generate_embedding_init(
            relative_embedding.embedding_init, relative_embedding.num_attention_heads,
            relative_embedding.num_buckets)

        relative_embedding_flax_module = flax_RelativePositionBiases(
            num_buckets=relative_embedding.num_buckets,
            max_distance=relative_embedding.max_distance,
            num_attention_heads=relative_embedding.num_attention_heads,
            embedding_init=TransformerEngineBaseLayer.generate_params_init(
                "rel_embedding", rel_embedding_init),
            embedding_axes=relative_embedding.embedding_axes,
            dtype=relative_embedding.dtype)

        praxis_p = pax_fiddle.Config(TransformerLayer,
                                     name='transformer_layer',
                                     params_init=kernel_init,
                                     dtype=dtype,
                                     hidden_size=hidden_size,
                                     mlp_hidden_size=mlp_hidden_size,
                                     num_attention_heads=num_attention_heads,
                                     layernorm_type=layernorm_type,
                                     hidden_dropout=hidden_dropout,
                                     attention_dropout=attention_dropout,
                                     mlp_activations=mlp_activations,
                                     use_bias=use_bias,
                                     bias_init=bias_init,
                                     layer_type=layer_type,
                                     enable_relative_embedding=enable_relative_embedding,
                                     relative_embedding=relative_embedding,
                                     drop_path=drop_path,
                                     transpose_batch_sequence=transpose_batch_sequence)
        flax_cls = partial(flax_TransformerLayer,
                           dtype=dtype,
                           hidden_size=hidden_size,
                           mlp_hidden_size=mlp_hidden_size,
                           num_attention_heads=num_attention_heads,
                           layernorm_type=layernorm_type,
                           hidden_dropout=hidden_dropout,
                           attention_dropout=attention_dropout,
                           mlp_activations=mlp_activations,
                           mha_kernel_init=TransformerEngineBaseLayer.generate_params_init(
                               "mha_kernel", kernel_init),
                           mlp_kernel_init=TransformerEngineBaseLayer.generate_params_init(
                               "mlp_kernel", kernel_init),
                           use_bias=use_bias,
                           bias_init=TransformerEngineBaseLayer.generate_params_init(
                               "bias", bias_init),
                           layer_type=layer_type,
                           enable_relative_embedding=enable_relative_embedding,
                           relative_embedding=relative_embedding_flax_module,
                           drop_path=drop_path,
                           transpose_batch_sequence=transpose_batch_sequence)

        return praxis_p, flax_cls

    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', TransformerLayerAttr.ATTRS)
    def test_forward_backward(self, data_shape, dtype, attrs, rtol=1e-05, atol=1e-08):
        praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
        self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)

    @pytest.mark.skipif(not is_fp8_supported, reason=reason)
    @pytest.mark.parametrize('data_shape', DATA_SHAPE)
    @pytest.mark.parametrize('dtype', DTYPE)
    @pytest.mark.parametrize('attrs', TransformerLayerAttr.ATTRS)
    @pytest.mark.parametrize('fp8_format', FP8_FORMATS)
    def test_forward_backward_fp8(self,
                                  data_shape,
                                  dtype,
                                  attrs,
                                  fp8_format,
                                  rtol=1e-05,
                                  atol=1e-08):

        ds = DelayedScaling(fp8_format=fp8_format)
        with fp8_autocast(enabled=True, fp8_recipe=ds):
            praxis_p, flax_cls = self.generate_praxis_p_and_flax_cls(dtype, attrs)
            self.forward_backward_runner(data_shape, dtype, praxis_p, flax_cls, rtol, atol)
