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# coding=utf-8
# Copyright 2024 The HuggingFace Team. 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.

import gc
import tempfile
import unittest

from transformers import AutoConfig, AutoModelForCausalLM, AutoTokenizer, FbgemmFp8Config, OPTForCausalLM
from transformers.testing_utils import (
    require_accelerate,
    require_fbgemm_gpu,
    require_read_token,
    require_torch_gpu,
    require_torch_multi_gpu,
    slow,
    torch_device,
)
from transformers.utils import is_accelerate_available, is_torch_available


if is_torch_available():
    import torch

if is_accelerate_available():
    from accelerate import init_empty_weights


@require_torch_gpu
class FbgemmFp8ConfigTest(unittest.TestCase):
    def test_to_dict(self):
        """
        Simple test that checks if one uses a config and converts it to a dict, the dict is the same as the config object
        """
        quantization_config = FbgemmFp8Config()
        config_to_dict = quantization_config.to_dict()

        for key in config_to_dict:
            self.assertEqual(getattr(quantization_config, key), config_to_dict[key])

    def test_from_dict(self):
        """
        Simple test that checks if one uses a dict and converts it to a config object, the config object is the same as the dict
        """
        dict = {"modules_to_not_convert": ["lm_head.weight"], "quant_method": "fbgemm_fp8"}
        quantization_config = FbgemmFp8Config.from_dict(dict)

        self.assertEqual(dict["modules_to_not_convert"], quantization_config.modules_to_not_convert)
        self.assertEqual(dict["quant_method"], quantization_config.quant_method)


@slow
@require_torch_gpu
@require_fbgemm_gpu
@require_accelerate
@require_read_token
class FbgemmFp8Test(unittest.TestCase):
    model_name = "meta-llama/Meta-Llama-3-8B"

    input_text = "What are we having for dinner?"
    max_new_tokens = 9

    EXPECTED_OUTPUT = "What are we having for dinner?\nI'm having a steak and a salad"

    device_map = "cuda"

    offload_device_map = {
        "model.embed_tokens": 0,
        "model.layers.0": 0,
        "model.layers.1": 0,
        "model.layers.2": 0,
        "model.layers.3": 0,
        "model.layers.4": 0,
        "model.layers.5": 0,
        "model.layers.6": 0,
        "model.layers.7": 0,
        "model.layers.8": 0,
        "model.layers.9": 0,
        "model.layers.10": 0,
        "model.layers.11": 0,
        "model.layers.12": 0,
        "model.layers.13": 0,
        "model.layers.14": 0,
        "model.layers.15": 0,
        "model.layers.16": "cpu",
        "model.layers.17": "cpu",
        "model.layers.18": "cpu",
        "model.layers.19": "cpu",
        "model.layers.20": "disk",
        "model.layers.21": "disk",
        "model.layers.22": "disk",
        "model.layers.23": "disk",
        "model.layers.24": "disk",
        "model.layers.25": "disk",
        "model.layers.26": "disk",
        "model.layers.27": "disk",
        "model.layers.28": "disk",
        "model.layers.29": "disk",
        "model.layers.30": "disk",
        "model.layers.31": "disk",
        "model.norm": "disk",
        "lm_head": "disk",
    }

    # called only once for all test in this class
    @classmethod
    def setUpClass(cls):
        """
        Setup quantized model
        """
        quantization_config = FbgemmFp8Config()
        cls.tokenizer = AutoTokenizer.from_pretrained(cls.model_name)
        cls.quantized_model = AutoModelForCausalLM.from_pretrained(
            cls.model_name, device_map=cls.device_map, quantization_config=quantization_config
        )

    def tearDown(self):
        gc.collect()
        torch.cuda.empty_cache()
        gc.collect()

    def test_quantized_model_conversion(self):
        """
        Simple test that checks if the quantized model has been converted properly
        """

        from transformers.integrations import FbgemmFp8Linear, replace_with_fbgemm_fp8_linear

        model_id = "facebook/opt-350m"
        config = AutoConfig.from_pretrained(model_id, revision="cb32f77e905cccbca1d970436fb0f5e6b58ee3c5")
        quantization_config = FbgemmFp8Config()

        with init_empty_weights():
            model = OPTForCausalLM(config)

        nb_linears = 0
        for module in model.modules():
            if isinstance(module, torch.nn.Linear):
                nb_linears += 1

        model = replace_with_fbgemm_fp8_linear(model, quantization_config=quantization_config)
        nb_fbgemm_linear = 0
        for module in model.modules():
            if isinstance(module, FbgemmFp8Linear):
                nb_fbgemm_linear += 1

        self.assertEqual(nb_linears - 1, nb_fbgemm_linear)

        with init_empty_weights():
            model = OPTForCausalLM(config)
        quantization_config = FbgemmFp8Config(modules_to_not_convert=["fc1"])
        model = replace_with_fbgemm_fp8_linear(model, quantization_config=quantization_config)
        nb_fbgemm_linear = 0
        for module in model.modules():
            if isinstance(module, FbgemmFp8Linear):
                nb_fbgemm_linear += 1

        self.assertEqual(nb_linears - 25, nb_fbgemm_linear)

    def test_quantized_model(self):
        """
        Simple test that checks if the quantized model is working properly
        """
        input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

        output = self.quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
        self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

    def test_save_pretrained(self):
        """
        Simple test that checks if the quantized model is working properly after being saved and loaded
        """
        with tempfile.TemporaryDirectory() as tmpdirname:
            self.quantized_model.save_pretrained(tmpdirname)

            model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map=self.device_map)

            input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

            output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
            self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

    def test_change_loading_attributes(self):
        """
        Simple test that checks if the quantized model is working properly after being saved and loaded
        """
        with tempfile.TemporaryDirectory() as tmpdirname:
            self.quantized_model.save_pretrained(tmpdirname)

            quantization_config = FbgemmFp8Config(activation_scale_ub=1000.0)

            model = AutoModelForCausalLM.from_pretrained(
                tmpdirname, device_map=self.device_map, quantization_config=quantization_config
            )

            self.assertEqual(model.model.layers[1].mlp.down_proj.input_scale_ub.item(), 1000.0)

            input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

            output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
            self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

    @require_torch_multi_gpu
    def test_quantized_model_multi_gpu(self):
        """
        Simple test that checks if the quantized model is working properly with multiple GPUs
        set CUDA_VISIBLE_DEVICES=0,1 if you have more than 2 GPUS
        """
        input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)
        quantization_config = FbgemmFp8Config()
        quantized_model = AutoModelForCausalLM.from_pretrained(
            self.model_name, device_map="auto", quantization_config=quantization_config
        )
        self.assertTrue(set(quantized_model.hf_device_map.values()) == {0, 1})

        output = quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
        self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

    def test_quantized_model_offload(self):
        """
        Simple test that checks if the quantized model returns an error when loading with cpu/disk offloaded
        """
        quantization_config = FbgemmFp8Config()

        with self.assertRaisesRegex(
            ValueError, "You are attempting to load an FP8 model with a device_map that contains a CPU or disk device."
        ):
            AutoModelForCausalLM.from_pretrained(
                self.model_name, device_map=self.offload_device_map, quantization_config=quantization_config
            )

    def test_save_pretrained_offload(self):
        """
        Simple test that checks if the saved quantized model is working properly cpu/disk offload
        """
        with tempfile.TemporaryDirectory() as tmpdirname:
            self.quantized_model.save_pretrained(tmpdirname)

            input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

            quantized_model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map=self.offload_device_map)
            output = quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
            self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

    @require_torch_multi_gpu
    def test_save_pretrained_multi_gpu(self):
        """
        Simple test that checks if the quantized model is working properly after being saved and loaded
        """
        with tempfile.TemporaryDirectory() as tmpdirname:
            self.quantized_model.save_pretrained(tmpdirname)

            model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map="auto")
            self.assertTrue(set(model.hf_device_map.values()) == {0, 1})

            input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

            output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
            self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)


@require_torch_gpu
@require_accelerate
@require_fbgemm_gpu
class FbgemmFp8LinearTest(unittest.TestCase):
    def test_linear_preserves_shape(self):
        """
        Test that FbgemmFp8Linear preserves shape when in_features == out_features.
        """
        from transformers.integrations import FbgemmFp8Linear

        with init_empty_weights(include_buffers=True):
            linear = FbgemmFp8Linear(1024, 1024, True)
            x = torch.rand((17, 23, 1024))

        x_ = linear(x)
        self.assertEqual(x_.shape, x.shape)

    def test_linear_with_diff_feature_size_preserves_shape(self):
        """
        Test that FbgemmFp8Linear generates the correct shape when in_features != out_features.
        """
        from transformers.integrations import FbgemmFp8Linear

        with init_empty_weights(include_buffers=True):
            linear = FbgemmFp8Linear(1024, 2048, True)
            x = torch.rand((17, 23, 1024))

        x_ = linear(x)
        self.assertEqual(x_.shape, (17, 23, 2048))

	# coding=utf-8
	# Copyright 2024 The HuggingFace Team. 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.

	import gc
	import tempfile
	import unittest

	from transformers import AutoConfig, AutoModelForCausalLM, AutoTokenizer, FbgemmFp8Config, OPTForCausalLM
	from transformers.testing_utils import (
	require_accelerate,
	require_fbgemm_gpu,
	require_read_token,
	require_torch_gpu,
	require_torch_multi_gpu,
	slow,
	torch_device,
	)
	from transformers.utils import is_accelerate_available, is_torch_available


	if is_torch_available():
	import torch

	if is_accelerate_available():
	from accelerate import init_empty_weights


	@require_torch_gpu
	class FbgemmFp8ConfigTest(unittest.TestCase):
	def test_to_dict(self):
	"""
	Simple test that checks if one uses a config and converts it to a dict, the dict is the same as the config object
	"""
	quantization_config = FbgemmFp8Config()
	config_to_dict = quantization_config.to_dict()

	for key in config_to_dict:
	self.assertEqual(getattr(quantization_config, key), config_to_dict[key])

	def test_from_dict(self):
	"""
	Simple test that checks if one uses a dict and converts it to a config object, the config object is the same as the dict
	"""
	dict = {"modules_to_not_convert": ["lm_head.weight"], "quant_method": "fbgemm_fp8"}
	quantization_config = FbgemmFp8Config.from_dict(dict)

	self.assertEqual(dict["modules_to_not_convert"], quantization_config.modules_to_not_convert)
	self.assertEqual(dict["quant_method"], quantization_config.quant_method)


	@slow
	@require_torch_gpu
	@require_fbgemm_gpu
	@require_accelerate
	@require_read_token
	class FbgemmFp8Test(unittest.TestCase):
	model_name = "meta-llama/Meta-Llama-3-8B"

	input_text = "What are we having for dinner?"
	max_new_tokens = 9

	EXPECTED_OUTPUT = "What are we having for dinner?\nI'm having a steak and a salad"

	device_map = "cuda"

	offload_device_map = {
	"model.embed_tokens": 0,
	"model.layers.0": 0,
	"model.layers.1": 0,
	"model.layers.2": 0,
	"model.layers.3": 0,
	"model.layers.4": 0,
	"model.layers.5": 0,
	"model.layers.6": 0,
	"model.layers.7": 0,
	"model.layers.8": 0,
	"model.layers.9": 0,
	"model.layers.10": 0,
	"model.layers.11": 0,
	"model.layers.12": 0,
	"model.layers.13": 0,
	"model.layers.14": 0,
	"model.layers.15": 0,
	"model.layers.16": "cpu",
	"model.layers.17": "cpu",
	"model.layers.18": "cpu",
	"model.layers.19": "cpu",
	"model.layers.20": "disk",
	"model.layers.21": "disk",
	"model.layers.22": "disk",
	"model.layers.23": "disk",
	"model.layers.24": "disk",
	"model.layers.25": "disk",
	"model.layers.26": "disk",
	"model.layers.27": "disk",
	"model.layers.28": "disk",
	"model.layers.29": "disk",
	"model.layers.30": "disk",
	"model.layers.31": "disk",
	"model.norm": "disk",
	"lm_head": "disk",
	}

	# called only once for all test in this class
	@classmethod
	def setUpClass(cls):
	"""
	Setup quantized model
	"""
	quantization_config = FbgemmFp8Config()
	cls.tokenizer = AutoTokenizer.from_pretrained(cls.model_name)
	cls.quantized_model = AutoModelForCausalLM.from_pretrained(
	cls.model_name, device_map=cls.device_map, quantization_config=quantization_config
	)

	def tearDown(self):
	gc.collect()
	torch.cuda.empty_cache()
	gc.collect()

	def test_quantized_model_conversion(self):
	"""
	Simple test that checks if the quantized model has been converted properly
	"""

	from transformers.integrations import FbgemmFp8Linear, replace_with_fbgemm_fp8_linear

	model_id = "facebook/opt-350m"
	config = AutoConfig.from_pretrained(model_id, revision="cb32f77e905cccbca1d970436fb0f5e6b58ee3c5")
	quantization_config = FbgemmFp8Config()

	with init_empty_weights():
	model = OPTForCausalLM(config)

	nb_linears = 0
	for module in model.modules():
	if isinstance(module, torch.nn.Linear):
	nb_linears += 1

	model = replace_with_fbgemm_fp8_linear(model, quantization_config=quantization_config)
	nb_fbgemm_linear = 0
	for module in model.modules():
	if isinstance(module, FbgemmFp8Linear):
	nb_fbgemm_linear += 1

	self.assertEqual(nb_linears - 1, nb_fbgemm_linear)

	with init_empty_weights():
	model = OPTForCausalLM(config)
	quantization_config = FbgemmFp8Config(modules_to_not_convert=["fc1"])
	model = replace_with_fbgemm_fp8_linear(model, quantization_config=quantization_config)
	nb_fbgemm_linear = 0
	for module in model.modules():
	if isinstance(module, FbgemmFp8Linear):
	nb_fbgemm_linear += 1

	self.assertEqual(nb_linears - 25, nb_fbgemm_linear)

	def test_quantized_model(self):
	"""
	Simple test that checks if the quantized model is working properly
	"""
	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

	output = self.quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

	def test_save_pretrained(self):
	"""
	Simple test that checks if the quantized model is working properly after being saved and loaded
	"""
	with tempfile.TemporaryDirectory() as tmpdirname:
	self.quantized_model.save_pretrained(tmpdirname)

	model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map=self.device_map)

	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

	output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

	def test_change_loading_attributes(self):
	"""
	Simple test that checks if the quantized model is working properly after being saved and loaded
	"""
	with tempfile.TemporaryDirectory() as tmpdirname:
	self.quantized_model.save_pretrained(tmpdirname)

	quantization_config = FbgemmFp8Config(activation_scale_ub=1000.0)

	model = AutoModelForCausalLM.from_pretrained(
	tmpdirname, device_map=self.device_map, quantization_config=quantization_config
	)

	self.assertEqual(model.model.layers[1].mlp.down_proj.input_scale_ub.item(), 1000.0)

	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

	output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

	@require_torch_multi_gpu
	def test_quantized_model_multi_gpu(self):
	"""
	Simple test that checks if the quantized model is working properly with multiple GPUs
	set CUDA_VISIBLE_DEVICES=0,1 if you have more than 2 GPUS
	"""
	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)
	quantization_config = FbgemmFp8Config()
	quantized_model = AutoModelForCausalLM.from_pretrained(
	self.model_name, device_map="auto", quantization_config=quantization_config
	)
	self.assertTrue(set(quantized_model.hf_device_map.values()) == {0, 1})

	output = quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

	def test_quantized_model_offload(self):
	"""
	Simple test that checks if the quantized model returns an error when loading with cpu/disk offloaded
	"""
	quantization_config = FbgemmFp8Config()

	with self.assertRaisesRegex(
	ValueError, "You are attempting to load an FP8 model with a device_map that contains a CPU or disk device."
	):
	AutoModelForCausalLM.from_pretrained(
	self.model_name, device_map=self.offload_device_map, quantization_config=quantization_config
	)

	def test_save_pretrained_offload(self):
	"""
	Simple test that checks if the saved quantized model is working properly cpu/disk offload
	"""
	with tempfile.TemporaryDirectory() as tmpdirname:
	self.quantized_model.save_pretrained(tmpdirname)

	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

	quantized_model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map=self.offload_device_map)
	output = quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)

	@require_torch_multi_gpu
	def test_save_pretrained_multi_gpu(self):
	"""
	Simple test that checks if the quantized model is working properly after being saved and loaded
	"""
	with tempfile.TemporaryDirectory() as tmpdirname:
	self.quantized_model.save_pretrained(tmpdirname)

	model = AutoModelForCausalLM.from_pretrained(tmpdirname, device_map="auto")
	self.assertTrue(set(model.hf_device_map.values()) == {0, 1})

	input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)

	output = model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
	self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)


	@require_torch_gpu
	@require_accelerate
	@require_fbgemm_gpu
	class FbgemmFp8LinearTest(unittest.TestCase):
	def test_linear_preserves_shape(self):
	"""
	Test that FbgemmFp8Linear preserves shape when in_features == out_features.
	"""
	from transformers.integrations import FbgemmFp8Linear

	with init_empty_weights(include_buffers=True):
	linear = FbgemmFp8Linear(1024, 1024, True)
	x = torch.rand((17, 23, 1024))

	x_ = linear(x)
	self.assertEqual(x_.shape, x.shape)

	def test_linear_with_diff_feature_size_preserves_shape(self):
	"""
	Test that FbgemmFp8Linear generates the correct shape when in_features != out_features.
	"""
	from transformers.integrations import FbgemmFp8Linear

	with init_empty_weights(include_buffers=True):
	linear = FbgemmFp8Linear(1024, 2048, True)
	x = torch.rand((17, 23, 1024))

	x_ = linear(x)
	self.assertEqual(x_.shape, (17, 23, 2048))