mirror of
https://github.com/NovaOSS/nova-api.git
synced 2024-11-25 21:33:58 +01:00
49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
import tiktoken
|
|
|
|
def count_for_messages(messages: list, model: str='gpt-3.5-turbo-0613') -> int:
|
|
"""Return the number of tokens used by a list of messages."""
|
|
|
|
try:
|
|
encoding = tiktoken.encoding_for_model(model)
|
|
|
|
except KeyError:
|
|
encoding = tiktoken.get_encoding('cl100k_base')
|
|
|
|
if model in {
|
|
'gpt-3.5-turbo-0613',
|
|
'gpt-3.5-turbo-16k-0613',
|
|
'gpt-4-0314',
|
|
'gpt-4-32k-0314',
|
|
'gpt-4-0613',
|
|
'gpt-4-32k-0613',
|
|
}:
|
|
tokens_per_message = 3
|
|
tokens_per_name = 1
|
|
|
|
elif model == 'gpt-3.5-turbo-0301':
|
|
tokens_per_message = 4 # every message follows <|start|>{role/name}\n{content}<|end|>\n
|
|
tokens_per_name = -1 # if there's a name, the role is omitted
|
|
|
|
elif 'gpt-3.5-turbo' in model:
|
|
return num_tokens_from_messages(messages, model='gpt-3.5-turbo-0613')
|
|
|
|
elif 'gpt-4' in model:
|
|
return num_tokens_from_messages(messages, model='gpt-4-0613')
|
|
|
|
else:
|
|
raise NotImplementedError(f"""num_tokens_from_messages() is not implemented for model {model}.
|
|
See https://github.com/openai/openai-python/blob/main/chatml.md
|
|
for information on how messages are converted to tokens.""")
|
|
|
|
num_tokens = 0
|
|
for message in messages:
|
|
num_tokens += tokens_per_message
|
|
for key, value in message.items():
|
|
num_tokens += len(encoding.encode(value))
|
|
if key == 'name':
|
|
num_tokens += tokens_per_name
|
|
|
|
num_tokens += 3 # every reply is primed with <|start|>assistant<|message|>
|
|
|
|
return num_tokens
|