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pt_to_tf.py
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pt_to_tf.py
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# Copyright 2022 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 os
from argparse import ArgumentParser, Namespace
from importlib import import_module
import numpy as np
from datasets import load_dataset
from huggingface_hub import Repository, upload_file
from .. import AutoConfig, AutoFeatureExtractor, AutoTokenizer, is_tf_available, is_torch_available
from ..utils import logging
from . import BaseTransformersCLICommand
if is_tf_available():
import tensorflow as tf
tf.config.experimental.enable_tensor_float_32_execution(False)
if is_torch_available():
import torch
MAX_ERROR = 5e-5 # larger error tolerance than in our internal tests, to avoid flaky user-facing errors
TF_WEIGHTS_NAME = "tf_model.h5"
def convert_command_factory(args: Namespace):
"""
Factory function used to convert a model PyTorch checkpoint in a TensorFlow 2 checkpoint.
Returns: ServeCommand
"""
return PTtoTFCommand(args.model_name, args.local_dir, args.new_weights, args.no_pr, args.push)
class PTtoTFCommand(BaseTransformersCLICommand):
@staticmethod
def register_subcommand(parser: ArgumentParser):
"""
Register this command to argparse so it's available for the transformer-cli
Args:
parser: Root parser to register command-specific arguments
"""
train_parser = parser.add_parser(
"pt-to-tf",
help=(
"CLI tool to run convert a transformers model from a PyTorch checkpoint to a TensorFlow checkpoint."
" Can also be used to validate existing weights without opening PRs, with --no-pr."
),
)
train_parser.add_argument(
"--model-name",
type=str,
required=True,
help="The model name, including owner/organization, as seen on the hub.",
)
train_parser.add_argument(
"--local-dir",
type=str,
default="",
help="Optional local directory of the model repository. Defaults to /tmp/{model_name}",
)
train_parser.add_argument(
"--new-weights",
action="store_true",
help="Optional flag to create new TensorFlow weights, even if they already exist.",
)
train_parser.add_argument(
"--no-pr", action="store_true", help="Optional flag to NOT open a PR with converted weights."
)
train_parser.add_argument(
"--push",
action="store_true",
help="Optional flag to push the weights directly to `main` (requires permissions)",
)
train_parser.set_defaults(func=convert_command_factory)
@staticmethod
def find_pt_tf_differences(pt_model, pt_input, tf_model, tf_input):
"""
Compares the TensorFlow and PyTorch models, given their inputs, returning a dictionary with all tensor
differences.
"""
pt_outputs = pt_model(**pt_input, output_hidden_states=True)
tf_outputs = tf_model(**tf_input, output_hidden_states=True)
# 1. All output attributes must be the same
pt_out_attrs = set(pt_outputs.keys())
tf_out_attrs = set(tf_outputs.keys())
if pt_out_attrs != tf_out_attrs:
raise ValueError(
f"The model outputs have different attributes, aborting. (Pytorch: {pt_out_attrs}, TensorFlow:"
f" {tf_out_attrs})"
)
# 2. For each output attribute, computes the difference
def _find_pt_tf_differences(pt_out, tf_out, differences, attr_name=""):
# If the current attribute is a tensor, it is a leaf and we make the comparison. Otherwise, we will dig in
# recursivelly, keeping the name of the attribute.
if isinstance(pt_out, torch.Tensor):
tensor_difference = np.max(np.abs(pt_out.detach().numpy() - tf_out.numpy()))
differences[attr_name] = tensor_difference
else:
root_name = attr_name
for i, pt_item in enumerate(pt_out):
# If it is a named attribute, we keep the name. Otherwise, just its index.
if isinstance(pt_item, str):
branch_name = root_name + pt_item
tf_item = tf_out[pt_item]
pt_item = pt_out[pt_item]
else:
branch_name = root_name + f"[{i}]"
tf_item = tf_out[i]
differences = _find_pt_tf_differences(pt_item, tf_item, differences, branch_name)
return differences
return _find_pt_tf_differences(pt_outputs, tf_outputs, {})
def __init__(self, model_name: str, local_dir: str, new_weights: bool, no_pr: bool, push: bool, *args):
self._logger = logging.get_logger("transformers-cli/pt_to_tf")
self._model_name = model_name
self._local_dir = local_dir if local_dir else os.path.join("/tmp", model_name)
self._new_weights = new_weights
self._no_pr = no_pr
self._push = push
def get_text_inputs(self):
tokenizer = AutoTokenizer.from_pretrained(self._local_dir)
sample_text = ["Hi there!", "I am a batch with more than one row and different input lengths."]
if tokenizer.pad_token is None:
tokenizer.pad_token = tokenizer.eos_token
pt_input = tokenizer(sample_text, return_tensors="pt", padding=True, truncation=True)
tf_input = tokenizer(sample_text, return_tensors="tf", padding=True, truncation=True)
return pt_input, tf_input
def get_audio_inputs(self):
processor = AutoFeatureExtractor.from_pretrained(self._local_dir)
num_samples = 2
ds = load_dataset("hf-internal-testing/librispeech_asr_dummy", "clean", split="validation")
speech_samples = ds.sort("id").select(range(num_samples))[:num_samples]["audio"]
raw_samples = [x["array"] for x in speech_samples]
pt_input = processor(raw_samples, return_tensors="pt", padding=True)
tf_input = processor(raw_samples, return_tensors="tf", padding=True)
return pt_input, tf_input
def get_image_inputs(self):
feature_extractor = AutoFeatureExtractor.from_pretrained(self._local_dir)
num_samples = 2
ds = load_dataset("cifar10", "plain_text", split="test")[:num_samples]["img"]
pt_input = feature_extractor(images=ds, return_tensors="pt")
tf_input = feature_extractor(images=ds, return_tensors="tf")
return pt_input, tf_input
def run(self):
# Fetch remote data
# TODO: implement a solution to pull a specific PR/commit, so we can use this CLI to validate pushes.
repo = Repository(local_dir=self._local_dir, clone_from=self._model_name)
repo.git_pull() # in case the repo already exists locally, but with an older commit
# Load config and get the appropriate architecture -- the latter is needed to convert the head's weights
config = AutoConfig.from_pretrained(self._local_dir)
architectures = config.architectures
if architectures is None: # No architecture defined -- use auto classes
pt_class = getattr(import_module("transformers"), "AutoModel")
tf_class = getattr(import_module("transformers"), "TFAutoModel")
self._logger.warn("No detected architecture, using AutoModel/TFAutoModel")
else: # Architecture defined -- use it
if len(architectures) > 1:
raise ValueError(f"More than one architecture was found, aborting. (architectures = {architectures})")
self._logger.warn(f"Detected architecture: {architectures[0]}")
pt_class = getattr(import_module("transformers"), architectures[0])
try:
tf_class = getattr(import_module("transformers"), "TF" + architectures[0])
except AttributeError:
raise AttributeError(f"The TensorFlow equivalent of {architectures[0]} doesn't exist in transformers.")
# Load models and acquire a basic input for its modality.
pt_model = pt_class.from_pretrained(self._local_dir)
main_input_name = pt_model.main_input_name
if main_input_name == "input_ids":
pt_input, tf_input = self.get_text_inputs()
elif main_input_name == "pixel_values":
pt_input, tf_input = self.get_image_inputs()
elif main_input_name == "input_features":
pt_input, tf_input = self.get_audio_inputs()
else:
raise ValueError(f"Can't detect the model modality (`main_input_name` = {main_input_name})")
tf_from_pt_model = tf_class.from_pretrained(self._local_dir, from_pt=True)
# Extra input requirements, in addition to the input modality
if config.is_encoder_decoder or (hasattr(pt_model, "encoder") and hasattr(pt_model, "decoder")):
decoder_input_ids = np.asarray([[1], [1]], dtype=int) * pt_model.config.decoder_start_token_id
pt_input.update({"decoder_input_ids": torch.tensor(decoder_input_ids)})
tf_input.update({"decoder_input_ids": tf.convert_to_tensor(decoder_input_ids)})
# Confirms that cross loading PT weights into TF worked.
crossload_differences = self.find_pt_tf_differences(pt_model, pt_input, tf_from_pt_model, tf_input)
max_crossload_diff = max(crossload_differences.values())
if max_crossload_diff > MAX_ERROR:
raise ValueError(
"The cross-loaded TensorFlow model has different outputs, something went wrong! Exaustive list of"
f" maximum tensor differences above the error threshold ({MAX_ERROR}):\n"
+ "\n".join(
[f"{key}: {value:.3e}" for key, value in crossload_differences.items() if value > MAX_ERROR]
)
)
# Save the weights in a TF format (if needed) and confirms that the results are still good
tf_weights_path = os.path.join(self._local_dir, TF_WEIGHTS_NAME)
if not os.path.exists(tf_weights_path) or self._new_weights:
tf_from_pt_model.save_weights(tf_weights_path)
del tf_from_pt_model # will no longer be used, and may have a large memory footprint
tf_model = tf_class.from_pretrained(self._local_dir)
conversion_differences = self.find_pt_tf_differences(pt_model, pt_input, tf_model, tf_input)
max_conversion_diff = max(conversion_differences.values())
if max_conversion_diff > MAX_ERROR:
raise ValueError(
"The converted TensorFlow model has different outputs, something went wrong! Exaustive list of maximum"
f" tensor differences above the error threshold ({MAX_ERROR}):\n"
+ "\n".join(
[f"{key}: {value:.3e}" for key, value in conversion_differences.items() if value > MAX_ERROR]
)
)
if self._push:
repo.git_add(auto_lfs_track=True)
repo.git_commit("Add TF weights")
repo.git_push(blocking=True) # this prints a progress bar with the upload
self._logger.warn(f"TF weights pushed into {self._model_name}")
else:
if not self._no_pr:
# TODO: remove try/except when the upload to PR feature is released
# (https://github.com/huggingface/huggingface_hub/pull/884)
try:
self._logger.warn("Uploading the weights into a new PR...")
hub_pr_url = upload_file(
path_or_fileobj=tf_weights_path,
path_in_repo=TF_WEIGHTS_NAME,
repo_id=self._model_name,
create_pr=True,
pr_commit_summary="Add TF weights",
pr_commit_description=(
"Model converted by the `transformers`' `pt_to_tf` CLI -- all converted model outputs and"
" hidden layers were validated against its Pytorch counterpart. Maximum crossload output"
f" difference={max_crossload_diff:.3e}; Maximum converted output"
f" difference={max_conversion_diff:.3e}."
),
)
self._logger.warn(f"PR open in {hub_pr_url}")
except TypeError:
self._logger.warn(
f"You can now open a PR in https://huggingface.co/{self._model_name}/discussions, manually"
f" uploading the file in {tf_weights_path}"
)