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bug fix - remove attn.bias keys from GPT state dict in 'from_pretrine… #122

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bug fix - remove attn.bias keys from GPT state dict in 'from_pretrine… #122

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3 changes: 2 additions & 1 deletion mingpt/model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,7 @@ def from_pretrained(cls, model_type):
config.block_size = 1024 # openai's model block_size
model = GPT(config)
sd = model.state_dict()
keys_sd = [k for k in sd if not k.endswith('.attn.bias')] # discard this mask / buffer, not a param

# init a huggingface/transformers model
model_hf = GPT2LMHeadModel.from_pretrained(model_type)
Expand All @@ -197,7 +198,7 @@ def from_pretrained(cls, model_type):
transposed = ['attn.c_attn.weight', 'attn.c_proj.weight', 'mlp.c_fc.weight', 'mlp.c_proj.weight']
# basically the openai checkpoints use a "Conv1D" module, but we only want to use a vanilla nn.Linear.
# this means that we have to transpose these weights when we import them
assert len(keys) == len(sd)
assert len(keys) == len(keys_sd)
for k in keys:
if any(k.endswith(w) for w in transposed):
# special treatment for the Conv1D weights we need to transpose
Expand Down