FunASR/funasr/train_utils/load_pretrained_model.py

from typing import Any
from typing import Dict
from typing import Union
from io import BytesIO

import logging
import torch
import torch.nn
import torch.optim


def filter_state_dict(
	dst_state: Dict[str, Union[float, torch.Tensor]],
	src_state: Dict[str, Union[float, torch.Tensor]],
):
	"""Filter name, size mismatch instances between dicts.

	Args:
		dst_state: reference state dict for filtering
		src_state: target state dict for filtering

	"""
	match_state = {}
	for key, value in src_state.items():
		if key in dst_state and (dst_state[key].size() == src_state[key].size()):
			match_state[key] = value
		else:
			if key not in dst_state:
				logging.warning(
					f"Filter out {key} from pretrained dict"
					+ " because of name not found in target dict"
				)
			else:
				logging.warning(
					f"Filter out {key} from pretrained dict"
					+ " because of size mismatch"
					+ f"({dst_state[key].size()}-{src_state[key].size()})"
				)
	return match_state

def assigment_scope_map(dst_state: dict, src_state: dict, scope_map: str=None):
	"""Compute the union of the current variables and checkpoint variables."""
	import collections
	import re

	# current model variables
	name_to_variable = collections.OrderedDict()
	for name, var in dst_state.items():
		name_to_variable[name] = var
	
	scope_map_num = 0
	if scope_map is not None:
		scope_map = scope_map.split(",")
		scope_map_num = len(scope_map) // 2
		for scope_map_idx in range(scope_map_num):
			scope_map_id = scope_map_idx * 2
			logging.info('assignment_map from scope {} to {}'.format(scope_map[scope_map_id], scope_map[scope_map_id+1]))
	
	assignment_map = {}
	for name, var in src_state.items():

		if scope_map:
			for scope_map_idx in range(scope_map_num):
				scope_map_id = scope_map_idx * 2
				try:
					idx = name.index(scope_map[scope_map_id])
					new_name = scope_map[scope_map_id+1] + name[idx + len(scope_map[scope_map_id]):]
					if new_name in name_to_variable:
						assignment_map[name] = var
				except:
					continue
		else:
			if name in name_to_variable:
				assignment_map[name] = var
	
	return assignment_map


def load_pretrained_model(
	path: str,
	model: torch.nn.Module,
	ignore_init_mismatch: bool,
	map_location: str = "cpu",
	oss_bucket=None,
	scope_map="module.:none",
	excludes=None,
):
	"""Load a model state and set it to the model.

	Args:
		init_param: <file_path>:<src_key>:<dst_key>:<exclude_Keys>

	Examples:

	"""
	
	obj = model
	dst_state = obj.state_dict()
	
	print(f"ckpt: {path}")
	if oss_bucket is None:
		src_state = torch.load(path, map_location=map_location)
	else:
		buffer = BytesIO(oss_bucket.get_object(path).read())
		src_state = torch.load(buffer, map_location=map_location)
	if "state_dict" in src_state:
		src_state = src_state["state_dict"]
	
	src_state = src_state["model"] if "model" in src_state else src_state
	
	if isinstance(scope_map, str):
		scope_map = scope_map.split(",")
	
	for k in dst_state.keys():
		# if not k.startswith("module.") and "module." + k in src_state.keys():
		# 	k_ddp = "module." + k
		# else:
		# 	k_ddp = k
		k_src = k

		if scope_map is not None:
			src_prefix = ""
			dst_prefix = ""
			for i in range(0, len(scope_map), 2):
				src_prefix = scope_map[i] if scope_map[i].lower() != "none" else ""
				dst_prefix = scope_map[i+1] if scope_map[i+1].lower() != "none" else ""

				if k.startswith(dst_prefix) and k.replace(dst_prefix, src_prefix) in src_state.keys():
					k_src = k.replace(dst_prefix, src_prefix)
					print(f"init param, map: {k} from {k_src} in ckpt")
					
		if k_src in src_state.keys():
			dst_state[k] = src_state[k_src]
				
		# if k_ddp.startswith("audio_encoder"):
		# 	if k_ddp.replace("audio_encoder", "encoder.model") in src_state.keys():
		# 		k_ddp = k_ddp.replace("audio_encoder", "encoder.model")
		# if k_ddp.startswith("adaptor"):
		# 	if k_ddp.replace("adaptor", "encoder_projector") in src_state.keys():
		# 		k_ddp = k_ddp.replace("adaptor", "encoder_projector")
		# if k_ddp in src_state:
		# 	dst_state[k] = src_state[k_ddp]
		else:
			print(f"Warning, miss key in ckpt: {k}, mapped: {k_src}")
			
	flag = obj.load_state_dict(dst_state, strict=False)
	# print(flag)