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# Copyright (c) OpenMMLab. All rights reserved.
import argparse
import os.path as osp
from collections import OrderedDict
import mmengine
import torch
from mmengine.runner import CheckpointLoader
def convert_mit(ckpt):
new_ckpt = OrderedDict()
# Process the concat between q linear weights and kv linear weights
for k, v in ckpt.items():
if k.startswith('head'):
continue
# patch embedding conversion
elif k.startswith('patch_embed'):
stage_i = int(k.split('.')[0].replace('patch_embed', ''))
new_k = k.replace(f'patch_embed{stage_i}', f'layers.{stage_i-1}.0')
new_v = v
if 'proj.' in new_k:
new_k = new_k.replace('proj.', 'projection.')
# transformer encoder layer conversion
elif k.startswith('block'):
stage_i = int(k.split('.')[0].replace('block', ''))
new_k = k.replace(f'block{stage_i}', f'layers.{stage_i-1}.1')
new_v = v
if 'attn.q.' in new_k:
sub_item_k = k.replace('q.', 'kv.')
new_k = new_k.replace('q.', 'attn.in_proj_')
new_v = torch.cat([v, ckpt[sub_item_k]], dim=0)
elif 'attn.kv.' in new_k:
continue
elif 'attn.proj.' in new_k:
new_k = new_k.replace('proj.', 'attn.out_proj.')
elif 'attn.sr.' in new_k:
new_k = new_k.replace('sr.', 'sr.')
elif 'mlp.' in new_k:
string = f'{new_k}-'
new_k = new_k.replace('mlp.', 'ffn.layers.')
if 'fc1.weight' in new_k or 'fc2.weight' in new_k:
new_v = v.reshape((*v.shape, 1, 1))
new_k = new_k.replace('fc1.', '0.')
new_k = new_k.replace('dwconv.dwconv.', '1.')
new_k = new_k.replace('fc2.', '4.')
string += f'{new_k} {v.shape}-{new_v.shape}'
# norm layer conversion
elif k.startswith('norm'):
stage_i = int(k.split('.')[0].replace('norm', ''))
new_k = k.replace(f'norm{stage_i}', f'layers.{stage_i-1}.2')
new_v = v
else:
new_k = k
new_v = v
new_ckpt[new_k] = new_v
return new_ckpt
def main():
parser = argparse.ArgumentParser(
description='Convert keys in official pretrained segformer to '
'MMSegmentation style.')
parser.add_argument('src', help='src model path or url')
# The dst path must be a full path of the new checkpoint.
parser.add_argument('dst', help='save path')
args = parser.parse_args()
checkpoint = CheckpointLoader.load_checkpoint(args.src, map_location='cpu')
if 'state_dict' in checkpoint:
state_dict = checkpoint['state_dict']
elif 'model' in checkpoint:
state_dict = checkpoint['model']
else:
state_dict = checkpoint
weight = convert_mit(state_dict)
mmengine.mkdir_or_exist(osp.dirname(args.dst))
torch.save(weight, args.dst)
if __name__ == '__main__':
main()
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