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[export] Fix serialize nn_module_stack #104721

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[export] Fix serialize nn_module_stack #104721

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19 changes: 15 additions & 4 deletions torch/_export/serde/serialize.py
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Original file line number Diff line number Diff line change
Expand Up @@ -235,10 +235,21 @@ def deserialize_meta_func(serialized_target: str):
key = kv[:key_idx]
assert kv[key_idx + 1] == "("
assert kv[-1] == ")"
values = kv[key_idx + 2: -1].split(",")
assert len(values) == 2
module = deserialize_meta_func(values[1])
nn_module_stack[key] = (values[0], module)

paren = 0
comma_idx = None
for i, c in enumerate(kv[key_idx + 2:-1]):
if c == "," and paren == 0:
assert comma_idx is None
comma_idx = i + key_idx + 2
elif c == "(":
paren += 1
elif c == ")":
paren -= 1

assert comma_idx is not None
module = deserialize_meta_func(kv[comma_idx + 1:-1])
nn_module_stack[key] = (kv[key_idx + 2:comma_idx], module)
ret["nn_module_stack"] = nn_module_stack

if source_fn_str := metadata.get("source_fn"):
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