trainer_state.json and zero_to_fp32.py
Browse files- trainer_state.json +784 -0
- zero_to_fp32.py +674 -0
trainer_state.json
ADDED
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@@ -0,0 +1,784 @@
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| 1 |
+
{
|
| 2 |
+
"best_global_step": null,
|
| 3 |
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"best_metric": null,
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| 4 |
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"best_model_checkpoint": null,
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| 5 |
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"epoch": 0.1718213058419244,
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| 6 |
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"eval_steps": 500,
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| 7 |
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"global_step": 50,
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| 8 |
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"is_hyper_param_search": false,
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| 9 |
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"is_local_process_zero": true,
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| 10 |
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"is_world_process_zero": true,
|
| 11 |
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"log_history": [
|
| 12 |
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{
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| 13 |
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"clip_ratio": 0.0,
|
| 14 |
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"completion_length": 3435.541748046875,
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| 15 |
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"epoch": 0.003436426116838488,
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| 16 |
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"grad_norm": 0.07630682736635208,
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| 17 |
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"kl": 0.0,
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| 18 |
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"learning_rate": 2e-08,
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| 19 |
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"loss": -0.0067,
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| 20 |
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"num_tokens": 1402750.0,
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| 21 |
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"reward": -0.28836290910840034,
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| 22 |
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"reward_std": 0.5228589028120041,
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| 23 |
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"rewards/cosine_scaled_reward": -0.19886894896626472,
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| 24 |
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"rewards/format_reward": 0.10937500093132257,
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| 25 |
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"step": 1
|
| 26 |
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},
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| 27 |
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{
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| 28 |
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"clip_ratio": 0.0,
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| 29 |
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"completion_length": 3328.8594360351562,
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| 30 |
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"epoch": 0.006872852233676976,
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| 31 |
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"grad_norm": 0.0795634388923645,
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| 32 |
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"kl": 0.0,
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| 33 |
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"learning_rate": 4e-08,
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| 34 |
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"loss": -0.0212,
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| 35 |
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"num_tokens": 2772778.0,
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| 36 |
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"reward": -0.24981184303760529,
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| 37 |
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"reward_std": 0.5158329159021378,
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| 38 |
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"rewards/cosine_scaled_reward": -0.21214550733566284,
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| 39 |
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"rewards/format_reward": 0.1744791679084301,
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| 40 |
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"step": 2
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| 41 |
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},
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| 42 |
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{
|
| 43 |
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"clip_ratio": 0.0,
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| 44 |
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"completion_length": 3388.9662475585938,
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|
zero_to_fp32.py
ADDED
|
@@ -0,0 +1,674 @@
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#!/usr/bin/env python
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# Copyright (c) Microsoft Corporation.
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# SPDX-License-Identifier: Apache-2.0
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# DeepSpeed Team
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# This script extracts fp32 consolidated weights from a zero 1, 2 and 3 DeepSpeed checkpoints. It gets
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# copied into the top level checkpoint dir, so the user can easily do the conversion at any point in
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# the future. Once extracted, the weights don't require DeepSpeed and can be used in any
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# application.
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#
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# example:
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# python zero_to_fp32.py . output_dir/
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# or
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# python zero_to_fp32.py . output_dir/ --safe_serialization
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import argparse
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import torch
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import glob
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import math
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import os
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import re
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import json
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from tqdm import tqdm
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from collections import OrderedDict
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from dataclasses import dataclass
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# while this script doesn't use deepspeed to recover data, since the checkpoints are pickled with
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# DeepSpeed data structures it has to be available in the current python environment.
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from deepspeed.utils import logger
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from deepspeed.checkpoint.constants import (DS_VERSION, OPTIMIZER_STATE_DICT, SINGLE_PARTITION_OF_FP32_GROUPS,
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FP32_FLAT_GROUPS, ZERO_STAGE, PARTITION_COUNT, PARAM_SHAPES, BUFFER_NAMES,
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FROZEN_PARAM_SHAPES, FROZEN_PARAM_FRAGMENTS)
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@dataclass
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class zero_model_state:
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buffers: dict()
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param_shapes: dict()
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shared_params: list
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ds_version: int
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frozen_param_shapes: dict()
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frozen_param_fragments: dict()
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debug = 0
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# load to cpu
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device = torch.device('cpu')
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def atoi(text):
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return int(text) if text.isdigit() else text
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def natural_keys(text):
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'''
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alist.sort(key=natural_keys) sorts in human order
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http://nedbatchelder.com/blog/200712/human_sorting.html
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(See Toothy's implementation in the comments)
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'''
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return [atoi(c) for c in re.split(r'(\d+)', text)]
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def get_model_state_file(checkpoint_dir, zero_stage):
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if not os.path.isdir(checkpoint_dir):
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raise FileNotFoundError(f"Directory '{checkpoint_dir}' doesn't exist")
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# there should be only one file
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if zero_stage <= 2:
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file = os.path.join(checkpoint_dir, "mp_rank_00_model_states.pt")
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elif zero_stage == 3:
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file = os.path.join(checkpoint_dir, "zero_pp_rank_0_mp_rank_00_model_states.pt")
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if not os.path.exists(file):
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raise FileNotFoundError(f"can't find model states file at '{file}'")
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return file
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def get_checkpoint_files(checkpoint_dir, glob_pattern):
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# XXX: need to test that this simple glob rule works for multi-node setup too
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ckpt_files = sorted(glob.glob(os.path.join(checkpoint_dir, glob_pattern)), key=natural_keys)
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if len(ckpt_files) == 0:
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raise FileNotFoundError(f"can't find {glob_pattern} files in directory '{checkpoint_dir}'")
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return ckpt_files
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def get_optim_files(checkpoint_dir):
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return get_checkpoint_files(checkpoint_dir, "*_optim_states.pt")
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def get_model_state_files(checkpoint_dir):
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return get_checkpoint_files(checkpoint_dir, "*_model_states.pt")
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def parse_model_states(files):
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zero_model_states = []
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for file in files:
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state_dict = torch.load(file, map_location=device)
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if BUFFER_NAMES not in state_dict:
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raise ValueError(f"{file} is not a model state checkpoint")
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buffer_names = state_dict[BUFFER_NAMES]
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if debug:
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print("Found buffers:", buffer_names)
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# recover just the buffers while restoring them to fp32 if they were saved in fp16
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buffers = {k: v.float() for k, v in state_dict["module"].items() if k in buffer_names}
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param_shapes = state_dict[PARAM_SHAPES]
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# collect parameters that are included in param_shapes
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param_names = []
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for s in param_shapes:
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for name in s.keys():
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param_names.append(name)
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# update with frozen parameters
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frozen_param_shapes = state_dict.get(FROZEN_PARAM_SHAPES, None)
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if frozen_param_shapes is not None:
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if debug:
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print(f"Found frozen_param_shapes: {frozen_param_shapes}")
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param_names += list(frozen_param_shapes.keys())
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# handle shared params
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shared_params = [[k, v] for k, v in state_dict["shared_params"].items()]
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ds_version = state_dict.get(DS_VERSION, None)
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frozen_param_fragments = state_dict.get(FROZEN_PARAM_FRAGMENTS, None)
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z_model_state = zero_model_state(buffers=buffers,
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param_shapes=param_shapes,
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shared_params=shared_params,
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ds_version=ds_version,
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frozen_param_shapes=frozen_param_shapes,
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frozen_param_fragments=frozen_param_fragments)
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zero_model_states.append(z_model_state)
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return zero_model_states
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def parse_optim_states(files, ds_checkpoint_dir):
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total_files = len(files)
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state_dicts = []
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for f in files:
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state_dict = torch.load(f, map_location=device)
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# immediately discard the potentially huge 2 optimizer states as we only care for fp32 master weights
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# and also handle the case where it was already removed by another helper script
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state_dict["optimizer_state_dict"].pop("optimizer_state_dict", None)
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state_dicts.append(state_dict)
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if not ZERO_STAGE in state_dicts[0][OPTIMIZER_STATE_DICT]:
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raise ValueError(f"{files[0]} is not a zero checkpoint")
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zero_stage = state_dicts[0][OPTIMIZER_STATE_DICT][ZERO_STAGE]
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world_size = state_dicts[0][OPTIMIZER_STATE_DICT][PARTITION_COUNT]
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# For ZeRO-2 each param group can have different partition_count as data parallelism for expert
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# parameters can be different from data parallelism for non-expert parameters. So we can just
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# use the max of the partition_count to get the dp world_size.
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if type(world_size) is list:
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world_size = max(world_size)
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if world_size != total_files:
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raise ValueError(
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f"Expected {world_size} of '*_optim_states.pt' under '{ds_checkpoint_dir}' but found {total_files} files. "
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"Possibly due to an overwrite of an old checkpoint, or a checkpoint didn't get saved by one or more processes."
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)
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# the groups are named differently in each stage
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if zero_stage <= 2:
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fp32_groups_key = SINGLE_PARTITION_OF_FP32_GROUPS
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elif zero_stage == 3:
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fp32_groups_key = FP32_FLAT_GROUPS
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else:
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raise ValueError(f"unknown zero stage {zero_stage}")
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if zero_stage <= 2:
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fp32_flat_groups = [state_dicts[i][OPTIMIZER_STATE_DICT][fp32_groups_key] for i in range(len(state_dicts))]
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elif zero_stage == 3:
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# if there is more than one param group, there will be multiple flattened tensors - one
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# flattened tensor per group - for simplicity merge them into a single tensor
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#
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# XXX: could make the script more memory efficient for when there are multiple groups - it
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# will require matching the sub-lists of param_shapes for each param group flattened tensor
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fp32_flat_groups = [
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torch.cat(state_dicts[i][OPTIMIZER_STATE_DICT][fp32_groups_key], 0) for i in range(len(state_dicts))
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]
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return zero_stage, world_size, fp32_flat_groups
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def _get_fp32_state_dict_from_zero_checkpoint(ds_checkpoint_dir, exclude_frozen_parameters):
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"""
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Returns fp32 state_dict reconstructed from ds checkpoint
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Args:
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- ``ds_checkpoint_dir``: path to the deepspeed checkpoint folder (where the optimizer files are)
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"""
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print(f"Processing zero checkpoint '{ds_checkpoint_dir}'")
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optim_files = get_optim_files(ds_checkpoint_dir)
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zero_stage, world_size, fp32_flat_groups = parse_optim_states(optim_files, ds_checkpoint_dir)
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print(f"Detected checkpoint of type zero stage {zero_stage}, world_size: {world_size}")
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model_files = get_model_state_files(ds_checkpoint_dir)
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zero_model_states = parse_model_states(model_files)
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print(f'Parsing checkpoint created by deepspeed=={zero_model_states[0].ds_version}')
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if zero_stage <= 2:
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return _get_fp32_state_dict_from_zero2_checkpoint(world_size, fp32_flat_groups, zero_model_states,
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exclude_frozen_parameters)
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elif zero_stage == 3:
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return _get_fp32_state_dict_from_zero3_checkpoint(world_size, fp32_flat_groups, zero_model_states,
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exclude_frozen_parameters)
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def _zero2_merge_frozen_params(state_dict, zero_model_states):
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if zero_model_states[0].frozen_param_shapes is None or len(zero_model_states[0].frozen_param_shapes) == 0:
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return
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frozen_param_shapes = zero_model_states[0].frozen_param_shapes
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frozen_param_fragments = zero_model_states[0].frozen_param_fragments
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if debug:
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num_elem = sum(s.numel() for s in frozen_param_shapes.values())
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print(f'rank 0: {FROZEN_PARAM_SHAPES}.numel = {num_elem}')
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wanted_params = len(frozen_param_shapes)
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wanted_numel = sum(s.numel() for s in frozen_param_shapes.values())
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avail_numel = sum([p.numel() for p in frozen_param_fragments.values()])
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print(f'Frozen params: Have {avail_numel} numels to process.')
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print(f'Frozen params: Need {wanted_numel} numels in {wanted_params} params')
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total_params = 0
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total_numel = 0
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for name, shape in frozen_param_shapes.items():
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total_params += 1
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unpartitioned_numel = shape.numel()
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total_numel += unpartitioned_numel
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state_dict[name] = frozen_param_fragments[name]
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if debug:
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print(f"{name} full shape: {shape} unpartitioned numel {unpartitioned_numel} ")
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print(f"Reconstructed Frozen fp32 state dict with {total_params} params {total_numel} elements")
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def _has_callable(obj, fn):
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attr = getattr(obj, fn, None)
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return callable(attr)
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def _zero2_merge_trainable_params(state_dict, world_size, fp32_flat_groups, zero_model_states):
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param_shapes = zero_model_states[0].param_shapes
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# Reconstruction protocol:
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#
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# XXX: document this
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if debug:
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for i in range(world_size):
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for j in range(len(fp32_flat_groups[0])):
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print(f"{FP32_FLAT_GROUPS}[{i}][{j}].shape={fp32_flat_groups[i][j].shape}")
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# XXX: memory usage doubles here (zero2)
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num_param_groups = len(fp32_flat_groups[0])
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merged_single_partition_of_fp32_groups = []
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for i in range(num_param_groups):
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merged_partitions = [sd[i] for sd in fp32_flat_groups]
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full_single_fp32_vector = torch.cat(merged_partitions, 0)
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merged_single_partition_of_fp32_groups.append(full_single_fp32_vector)
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avail_numel = sum(
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[full_single_fp32_vector.numel() for full_single_fp32_vector in merged_single_partition_of_fp32_groups])
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+
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if debug:
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wanted_params = sum([len(shapes) for shapes in param_shapes])
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wanted_numel = sum([sum(shape.numel() for shape in shapes.values()) for shapes in param_shapes])
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# not asserting if there is a mismatch due to possible padding
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print(f"Have {avail_numel} numels to process.")
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print(f"Need {wanted_numel} numels in {wanted_params} params.")
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# params
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# XXX: for huge models that can't fit into the host's RAM we will have to recode this to support
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# out-of-core computing solution
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total_numel = 0
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total_params = 0
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for shapes, full_single_fp32_vector in zip(param_shapes, merged_single_partition_of_fp32_groups):
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offset = 0
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avail_numel = full_single_fp32_vector.numel()
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for name, shape in shapes.items():
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+
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unpartitioned_numel = shape.numel() if _has_callable(shape, 'numel') else math.prod(shape)
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total_numel += unpartitioned_numel
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total_params += 1
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+
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if debug:
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print(f"{name} full shape: {shape} unpartitioned numel {unpartitioned_numel} ")
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state_dict[name] = full_single_fp32_vector.narrow(0, offset, unpartitioned_numel).view(shape)
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offset += unpartitioned_numel
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+
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# Z2 started to align to 2*world_size to improve nccl performance. Therefore both offset and
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# avail_numel can differ by anywhere between 0..2*world_size. Due to two unrelated complex
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# paddings performed in the code it's almost impossible to predict the exact numbers w/o the
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# live optimizer object, so we are checking that the numbers are within the right range
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align_to = 2 * world_size
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+
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def zero2_align(x):
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return align_to * math.ceil(x / align_to)
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+
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if debug:
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print(f"original offset={offset}, avail_numel={avail_numel}")
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+
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offset = zero2_align(offset)
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avail_numel = zero2_align(avail_numel)
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+
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if debug:
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print(f"aligned offset={offset}, avail_numel={avail_numel}")
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+
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# Sanity check
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if offset != avail_numel:
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raise ValueError(f"consumed {offset} numels out of {avail_numel} - something is wrong")
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+
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print(f"Reconstructed fp32 state dict with {total_params} params {total_numel} elements")
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+
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+
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def _get_fp32_state_dict_from_zero2_checkpoint(world_size, fp32_flat_groups, zero_model_states,
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exclude_frozen_parameters):
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| 337 |
+
state_dict = OrderedDict()
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+
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+
# buffers
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+
buffers = zero_model_states[0].buffers
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+
state_dict.update(buffers)
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| 342 |
+
if debug:
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| 343 |
+
print(f"added {len(buffers)} buffers")
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| 344 |
+
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+
if not exclude_frozen_parameters:
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_zero2_merge_frozen_params(state_dict, zero_model_states)
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+
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_zero2_merge_trainable_params(state_dict, world_size, fp32_flat_groups, zero_model_states)
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| 349 |
+
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+
# recover shared parameters
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| 351 |
+
for pair in zero_model_states[0].shared_params:
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| 352 |
+
if pair[1] in state_dict:
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+
state_dict[pair[0]] = state_dict[pair[1]]
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+
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| 355 |
+
return state_dict
|
| 356 |
+
|
| 357 |
+
|
| 358 |
+
def zero3_partitioned_param_info(unpartitioned_numel, world_size):
|
| 359 |
+
remainder = unpartitioned_numel % world_size
|
| 360 |
+
padding_numel = (world_size - remainder) if remainder else 0
|
| 361 |
+
partitioned_numel = math.ceil(unpartitioned_numel / world_size)
|
| 362 |
+
return partitioned_numel, padding_numel
|
| 363 |
+
|
| 364 |
+
|
| 365 |
+
def _zero3_merge_frozen_params(state_dict, world_size, zero_model_states):
|
| 366 |
+
if zero_model_states[0].frozen_param_shapes is None or len(zero_model_states[0].frozen_param_shapes) == 0:
|
| 367 |
+
return
|
| 368 |
+
|
| 369 |
+
if debug:
|
| 370 |
+
for i in range(world_size):
|
| 371 |
+
num_elem = sum(s.numel() for s in zero_model_states[i].frozen_param_fragments.values())
|
| 372 |
+
print(f'rank {i}: {FROZEN_PARAM_SHAPES}.numel = {num_elem}')
|
| 373 |
+
|
| 374 |
+
frozen_param_shapes = zero_model_states[0].frozen_param_shapes
|
| 375 |
+
wanted_params = len(frozen_param_shapes)
|
| 376 |
+
wanted_numel = sum(s.numel() for s in frozen_param_shapes.values())
|
| 377 |
+
avail_numel = sum([p.numel() for p in zero_model_states[0].frozen_param_fragments.values()]) * world_size
|
| 378 |
+
print(f'Frozen params: Have {avail_numel} numels to process.')
|
| 379 |
+
print(f'Frozen params: Need {wanted_numel} numels in {wanted_params} params')
|
| 380 |
+
|
| 381 |
+
total_params = 0
|
| 382 |
+
total_numel = 0
|
| 383 |
+
for name, shape in zero_model_states[0].frozen_param_shapes.items():
|
| 384 |
+
total_params += 1
|
| 385 |
+
unpartitioned_numel = shape.numel()
|
| 386 |
+
total_numel += unpartitioned_numel
|
| 387 |
+
|
| 388 |
+
param_frags = tuple(model_state.frozen_param_fragments[name] for model_state in zero_model_states)
|
| 389 |
+
state_dict[name] = torch.cat(param_frags, 0).narrow(0, 0, unpartitioned_numel).view(shape)
|
| 390 |
+
|
| 391 |
+
partitioned_numel, partitioned_padding_numel = zero3_partitioned_param_info(unpartitioned_numel, world_size)
|
| 392 |
+
|
| 393 |
+
if debug:
|
| 394 |
+
print(
|
| 395 |
+
f"Frozen params: {total_params} {name} full shape: {shape} partition0 numel={partitioned_numel} partitioned_padding_numel={partitioned_padding_numel}"
|
| 396 |
+
)
|
| 397 |
+
|
| 398 |
+
print(f"Reconstructed Frozen fp32 state dict with {total_params} params {total_numel} elements")
|
| 399 |
+
|
| 400 |
+
|
| 401 |
+
def _zero3_merge_trainable_params(state_dict, world_size, fp32_flat_groups, zero_model_states):
|
| 402 |
+
param_shapes = zero_model_states[0].param_shapes
|
| 403 |
+
avail_numel = fp32_flat_groups[0].numel() * world_size
|
| 404 |
+
# Reconstruction protocol: For zero3 we need to zip the partitions together at boundary of each
|
| 405 |
+
# param, re-consolidating each param, while dealing with padding if any
|
| 406 |
+
|
| 407 |
+
# merge list of dicts, preserving order
|
| 408 |
+
param_shapes = {k: v for d in param_shapes for k, v in d.items()}
|
| 409 |
+
|
| 410 |
+
if debug:
|
| 411 |
+
for i in range(world_size):
|
| 412 |
+
print(f"{FP32_FLAT_GROUPS}[{i}].shape={fp32_flat_groups[i].shape}")
|
| 413 |
+
|
| 414 |
+
wanted_params = len(param_shapes)
|
| 415 |
+
wanted_numel = sum(shape.numel() for shape in param_shapes.values())
|
| 416 |
+
# not asserting if there is a mismatch due to possible padding
|
| 417 |
+
avail_numel = fp32_flat_groups[0].numel() * world_size
|
| 418 |
+
print(f"Trainable params: Have {avail_numel} numels to process.")
|
| 419 |
+
print(f"Trainable params: Need {wanted_numel} numels in {wanted_params} params.")
|
| 420 |
+
|
| 421 |
+
# params
|
| 422 |
+
# XXX: for huge models that can't fit into the host's RAM we will have to recode this to support
|
| 423 |
+
# out-of-core computing solution
|
| 424 |
+
offset = 0
|
| 425 |
+
total_numel = 0
|
| 426 |
+
total_params = 0
|
| 427 |
+
for name, shape in tqdm(param_shapes.items(), desc='Gathering Sharded Weights'):
|
| 428 |
+
unpartitioned_numel = shape.numel()
|
| 429 |
+
total_numel += unpartitioned_numel
|
| 430 |
+
total_params += 1
|
| 431 |
+
partitioned_numel, partitioned_padding_numel = zero3_partitioned_param_info(unpartitioned_numel, world_size)
|
| 432 |
+
|
| 433 |
+
if debug:
|
| 434 |
+
print(
|
| 435 |
+
f"Trainable params: {total_params} {name} full shape: {shape} partition0 numel={partitioned_numel} partitioned_padding_numel={partitioned_padding_numel}"
|
| 436 |
+
)
|
| 437 |
+
|
| 438 |
+
# XXX: memory usage doubles here
|
| 439 |
+
state_dict[name] = torch.cat(
|
| 440 |
+
tuple(fp32_flat_groups[i].narrow(0, offset, partitioned_numel) for i in range(world_size)),
|
| 441 |
+
0).narrow(0, 0, unpartitioned_numel).view(shape)
|
| 442 |
+
offset += partitioned_numel
|
| 443 |
+
|
| 444 |
+
offset *= world_size
|
| 445 |
+
|
| 446 |
+
# Sanity check
|
| 447 |
+
if offset != avail_numel:
|
| 448 |
+
raise ValueError(f"consumed {offset} numels out of {avail_numel} - something is wrong")
|
| 449 |
+
|
| 450 |
+
print(f"Reconstructed Trainable fp32 state dict with {total_params} params {total_numel} elements")
|
| 451 |
+
|
| 452 |
+
|
| 453 |
+
def _get_fp32_state_dict_from_zero3_checkpoint(world_size, fp32_flat_groups, zero_model_states,
|
| 454 |
+
exclude_frozen_parameters):
|
| 455 |
+
state_dict = OrderedDict()
|
| 456 |
+
|
| 457 |
+
# buffers
|
| 458 |
+
buffers = zero_model_states[0].buffers
|
| 459 |
+
state_dict.update(buffers)
|
| 460 |
+
if debug:
|
| 461 |
+
print(f"added {len(buffers)} buffers")
|
| 462 |
+
|
| 463 |
+
if not exclude_frozen_parameters:
|
| 464 |
+
_zero3_merge_frozen_params(state_dict, world_size, zero_model_states)
|
| 465 |
+
|
| 466 |
+
_zero3_merge_trainable_params(state_dict, world_size, fp32_flat_groups, zero_model_states)
|
| 467 |
+
|
| 468 |
+
# recover shared parameters
|
| 469 |
+
for pair in zero_model_states[0].shared_params:
|
| 470 |
+
if pair[1] in state_dict:
|
| 471 |
+
state_dict[pair[0]] = state_dict[pair[1]]
|
| 472 |
+
|
| 473 |
+
return state_dict
|
| 474 |
+
|
| 475 |
+
|
| 476 |
+
def get_fp32_state_dict_from_zero_checkpoint(checkpoint_dir, tag=None, exclude_frozen_parameters=False):
|
| 477 |
+
"""
|
| 478 |
+
Convert ZeRO 2 or 3 checkpoint into a single fp32 consolidated state_dict that can be loaded with
|
| 479 |
+
``load_state_dict()`` and used for training without DeepSpeed or shared with others, for example
|
| 480 |
+
via a model hub.
|
| 481 |
+
|
| 482 |
+
Args:
|
| 483 |
+
- ``checkpoint_dir``: path to the desired checkpoint folder
|
| 484 |
+
- ``tag``: checkpoint tag used as a unique identifier for checkpoint. If not provided will attempt to load tag in 'latest' file. e.g., ``global_step14``
|
| 485 |
+
- ``exclude_frozen_parameters``: exclude frozen parameters
|
| 486 |
+
|
| 487 |
+
Returns:
|
| 488 |
+
- pytorch ``state_dict``
|
| 489 |
+
|
| 490 |
+
Note: this approach may not work if your application doesn't have sufficient free CPU memory and
|
| 491 |
+
you may need to use the offline approach using the ``zero_to_fp32.py`` script that is saved with
|
| 492 |
+
the checkpoint.
|
| 493 |
+
|
| 494 |
+
A typical usage might be ::
|
| 495 |
+
|
| 496 |
+
from deepspeed.utils.zero_to_fp32 import get_fp32_state_dict_from_zero_checkpoint
|
| 497 |
+
# do the training and checkpoint saving
|
| 498 |
+
state_dict = get_fp32_state_dict_from_zero_checkpoint(checkpoint_dir) # already on cpu
|
| 499 |
+
model = model.cpu() # move to cpu
|
| 500 |
+
model.load_state_dict(state_dict)
|
| 501 |
+
# submit to model hub or save the model to share with others
|
| 502 |
+
|
| 503 |
+
In this example the ``model`` will no longer be usable in the deepspeed context of the same
|
| 504 |
+
application. i.e. you will need to re-initialize the deepspeed engine, since
|
| 505 |
+
``model.load_state_dict(state_dict)`` will remove all the deepspeed magic from it.
|
| 506 |
+
|
| 507 |
+
If you want it all done for you, use ``load_state_dict_from_zero_checkpoint`` instead.
|
| 508 |
+
|
| 509 |
+
"""
|
| 510 |
+
if tag is None:
|
| 511 |
+
latest_path = os.path.join(checkpoint_dir, 'latest')
|
| 512 |
+
if os.path.isfile(latest_path):
|
| 513 |
+
with open(latest_path, 'r') as fd:
|
| 514 |
+
tag = fd.read().strip()
|
| 515 |
+
else:
|
| 516 |
+
raise ValueError(f"Unable to find 'latest' file at {latest_path}")
|
| 517 |
+
|
| 518 |
+
ds_checkpoint_dir = os.path.join(checkpoint_dir, tag)
|
| 519 |
+
|
| 520 |
+
if not os.path.isdir(ds_checkpoint_dir):
|
| 521 |
+
raise FileNotFoundError(f"Directory '{ds_checkpoint_dir}' doesn't exist")
|
| 522 |
+
|
| 523 |
+
return _get_fp32_state_dict_from_zero_checkpoint(ds_checkpoint_dir, exclude_frozen_parameters)
|
| 524 |
+
|
| 525 |
+
|
| 526 |
+
def convert_zero_checkpoint_to_fp32_state_dict(checkpoint_dir,
|
| 527 |
+
output_dir,
|
| 528 |
+
max_shard_size="5GB",
|
| 529 |
+
safe_serialization=False,
|
| 530 |
+
tag=None,
|
| 531 |
+
exclude_frozen_parameters=False):
|
| 532 |
+
"""
|
| 533 |
+
Convert ZeRO 2 or 3 checkpoint into a single fp32 consolidated ``state_dict`` file that can be
|
| 534 |
+
loaded with ``torch.load(file)`` + ``load_state_dict()`` and used for training without DeepSpeed.
|
| 535 |
+
|
| 536 |
+
Args:
|
| 537 |
+
- ``checkpoint_dir``: path to the desired checkpoint folder. (one that contains the tag-folder, like ``global_step14``)
|
| 538 |
+
- ``output_dir``: directory to the pytorch fp32 state_dict output files
|
| 539 |
+
- ``max_shard_size``: the maximum size for a checkpoint before being sharded, default value is 5GB
|
| 540 |
+
- ``safe_serialization``: whether to save the model using `safetensors` or the traditional PyTorch way (that uses `pickle`).
|
| 541 |
+
- ``tag``: checkpoint tag used as a unique identifier for checkpoint. If not provided will attempt to load tag in the file named ``latest`` in the checkpoint folder, e.g., ``global_step14``
|
| 542 |
+
- ``exclude_frozen_parameters``: exclude frozen parameters
|
| 543 |
+
"""
|
| 544 |
+
# Dependency pre-check
|
| 545 |
+
if safe_serialization:
|
| 546 |
+
try:
|
| 547 |
+
from safetensors.torch import save_file
|
| 548 |
+
except ImportError:
|
| 549 |
+
print('If you want to use `safe_serialization`, please `pip install safetensors`')
|
| 550 |
+
raise
|
| 551 |
+
if max_shard_size is not None:
|
| 552 |
+
try:
|
| 553 |
+
from huggingface_hub import split_torch_state_dict_into_shards
|
| 554 |
+
except ImportError:
|
| 555 |
+
print('If you want to use `max_shard_size`, please `pip install huggingface_hub`')
|
| 556 |
+
raise
|
| 557 |
+
|
| 558 |
+
# Convert zero checkpoint to state_dict
|
| 559 |
+
state_dict = get_fp32_state_dict_from_zero_checkpoint(checkpoint_dir, tag, exclude_frozen_parameters)
|
| 560 |
+
|
| 561 |
+
# Shard the model if it is too big.
|
| 562 |
+
weights_name = "model.safetensors" if safe_serialization else "pytorch_model.bin"
|
| 563 |
+
if max_shard_size is not None:
|
| 564 |
+
filename_pattern = weights_name.replace(".bin", "{suffix}.bin").replace(".safetensors", "{suffix}.safetensors")
|
| 565 |
+
state_dict_split = split_torch_state_dict_into_shards(state_dict,
|
| 566 |
+
filename_pattern=filename_pattern,
|
| 567 |
+
max_shard_size=max_shard_size)
|
| 568 |
+
else:
|
| 569 |
+
from collections import namedtuple
|
| 570 |
+
StateDictSplit = namedtuple("StateDictSplit", ["is_sharded", "filename_to_tensors"])
|
| 571 |
+
state_dict_split = StateDictSplit(is_sharded=False,
|
| 572 |
+
filename_to_tensors={weights_name: list(state_dict.keys())})
|
| 573 |
+
|
| 574 |
+
# Save the model
|
| 575 |
+
filename_to_tensors = state_dict_split.filename_to_tensors.items()
|
| 576 |
+
for shard_file, tensors in tqdm(filename_to_tensors, desc="Saving checkpoint shards"):
|
| 577 |
+
shard = {tensor: state_dict[tensor].contiguous() for tensor in tensors}
|
| 578 |
+
output_path = os.path.join(output_dir, shard_file)
|
| 579 |
+
if safe_serialization:
|
| 580 |
+
save_file(shard, output_path, metadata={"format": "pt"})
|
| 581 |
+
else:
|
| 582 |
+
torch.save(shard, output_path)
|
| 583 |
+
|
| 584 |
+
# Save index if sharded
|
| 585 |
+
if state_dict_split.is_sharded:
|
| 586 |
+
index = {
|
| 587 |
+
"metadata": state_dict_split.metadata,
|
| 588 |
+
"weight_map": state_dict_split.tensor_to_filename,
|
| 589 |
+
}
|
| 590 |
+
save_index_file = "model.safetensors.index.json" if safe_serialization else "pytorch_model.bin.index.json"
|
| 591 |
+
save_index_file = os.path.join(output_dir, save_index_file)
|
| 592 |
+
with open(save_index_file, "w", encoding="utf-8") as f:
|
| 593 |
+
content = json.dumps(index, indent=2, sort_keys=True) + "\n"
|
| 594 |
+
f.write(content)
|
| 595 |
+
|
| 596 |
+
|
| 597 |
+
def load_state_dict_from_zero_checkpoint(model, checkpoint_dir, tag=None):
|
| 598 |
+
"""
|
| 599 |
+
1. Put the provided model to cpu
|
| 600 |
+
2. Convert ZeRO 2 or 3 checkpoint into a single fp32 consolidated ``state_dict``
|
| 601 |
+
3. Load it into the provided model
|
| 602 |
+
|
| 603 |
+
Args:
|
| 604 |
+
- ``model``: the model object to update
|
| 605 |
+
- ``checkpoint_dir``: path to the desired checkpoint folder. (one that contains the tag-folder, like ``global_step14``)
|
| 606 |
+
- ``tag``: checkpoint tag used as a unique identifier for checkpoint. If not provided will attempt to load tag in the file named ``latest`` in the checkpoint folder, e.g., ``global_step14``
|
| 607 |
+
|
| 608 |
+
Returns:
|
| 609 |
+
- ``model`: modified model
|
| 610 |
+
|
| 611 |
+
Make sure you have plenty of CPU memory available before you call this function. If you don't
|
| 612 |
+
have enough use the ``zero_to_fp32.py`` utility to do the conversion. You will find it
|
| 613 |
+
conveniently placed for you in the checkpoint folder.
|
| 614 |
+
|
| 615 |
+
A typical usage might be ::
|
| 616 |
+
|
| 617 |
+
from deepspeed.utils.zero_to_fp32 import load_state_dict_from_zero_checkpoint
|
| 618 |
+
model = load_state_dict_from_zero_checkpoint(trainer.model, checkpoint_dir)
|
| 619 |
+
# submit to model hub or save the model to share with others
|
| 620 |
+
|
| 621 |
+
Note, that once this was run, the ``model`` will no longer be usable in the deepspeed context
|
| 622 |
+
of the same application. i.e. you will need to re-initialize the deepspeed engine, since
|
| 623 |
+
``model.load_state_dict(state_dict)`` will remove all the deepspeed magic from it.
|
| 624 |
+
|
| 625 |
+
"""
|
| 626 |
+
logger.info(f"Extracting fp32 weights")
|
| 627 |
+
state_dict = get_fp32_state_dict_from_zero_checkpoint(checkpoint_dir, tag)
|
| 628 |
+
|
| 629 |
+
logger.info(f"Overwriting model with fp32 weights")
|
| 630 |
+
model = model.cpu()
|
| 631 |
+
model.load_state_dict(state_dict, strict=False)
|
| 632 |
+
|
| 633 |
+
return model
|
| 634 |
+
|
| 635 |
+
|
| 636 |
+
if __name__ == "__main__":
|
| 637 |
+
parser = argparse.ArgumentParser()
|
| 638 |
+
parser.add_argument("checkpoint_dir",
|
| 639 |
+
type=str,
|
| 640 |
+
help="path to the desired checkpoint folder, e.g., path/checkpoint-12")
|
| 641 |
+
parser.add_argument("output_dir",
|
| 642 |
+
type=str,
|
| 643 |
+
help="directory to the pytorch fp32 state_dict output files"
|
| 644 |
+
"(e.g. path/checkpoint-12-output/)")
|
| 645 |
+
parser.add_argument(
|
| 646 |
+
"--max_shard_size",
|
| 647 |
+
type=str,
|
| 648 |
+
default="5GB",
|
| 649 |
+
help="The maximum size for a checkpoint before being sharded. Checkpoints shard will then be each of size"
|
| 650 |
+
"lower than this size. If expressed as a string, needs to be digits followed by a unit (like `5MB`"
|
| 651 |
+
"We default it to 5GB in order for models to be able to run easily on free-tier google colab instances"
|
| 652 |
+
"without CPU OOM issues.")
|
| 653 |
+
parser.add_argument(
|
| 654 |
+
"--safe_serialization",
|
| 655 |
+
default=False,
|
| 656 |
+
action='store_true',
|
| 657 |
+
help="Whether to save the model using `safetensors` or the traditional PyTorch way (that uses `pickle`).")
|
| 658 |
+
parser.add_argument("-t",
|
| 659 |
+
"--tag",
|
| 660 |
+
type=str,
|
| 661 |
+
default=None,
|
| 662 |
+
help="checkpoint tag used as a unique identifier for checkpoint. e.g., global_step1")
|
| 663 |
+
parser.add_argument("--exclude_frozen_parameters", action='store_true', help="exclude frozen parameters")
|
| 664 |
+
parser.add_argument("-d", "--debug", action='store_true', help="enable debug")
|
| 665 |
+
args = parser.parse_args()
|
| 666 |
+
|
| 667 |
+
debug = args.debug
|
| 668 |
+
|
| 669 |
+
convert_zero_checkpoint_to_fp32_state_dict(args.checkpoint_dir,
|
| 670 |
+
args.output_dir,
|
| 671 |
+
max_shard_size=args.max_shard_size,
|
| 672 |
+
safe_serialization=args.safe_serialization,
|
| 673 |
+
tag=args.tag,
|
| 674 |
+
exclude_frozen_parameters=args.exclude_frozen_parameters)
|