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Updated decode() method in GPT4Tokenizer so that it handles special t… #63

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Updated decode() method in GPT4Tokenizer so that it handles special t… #63

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15 changes: 12 additions & 3 deletions minbpe/gpt4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -85,9 +85,18 @@ def _encode_chunk(self, text_bytes):
return ids

def decode(self, ids):
# we have to un-permute the bytes before we decode
text_bytes = b"".join(self.vocab[idx] for idx in ids)
text_bytes = bytes(self.inverse_byte_shuffle[b] for b in text_bytes)
# given ids (list of integers), return Python string
part_bytes = []
for idx in ids:
if idx in self.vocab:
shuffled_bytes = self.vocab[idx]
unshuffled_bytes = bytes([self.inverse_byte_shuffle[b] for b in shuffled_bytes])
part_bytes.append(unshuffled_bytes)
elif idx in self.inverse_special_tokens:
part_bytes.append(self.inverse_special_tokens[idx].encode("utf-8"))
else:
raise ValueError(f"invalid token id: {idx}")
text_bytes = b"".join(part_bytes)
text = text_bytes.decode("utf-8", errors="replace")
return text

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