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5a350a7622
Broad 'except Exception' could silently swallow unexpected failures. URLError and ConnectionError are both subclasses of OSError, so 'except (ImportError, OSError)' captures all real offline/not-installed cases while letting genuine programming errors propagate. Also include the exception detail in the warning message so failures are diagnosable in logs. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
"""
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Token utilities for Open Notebook.
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Handles token counting and cost calculations for language models.
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"""
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import os
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from open_notebook.config import TIKTOKEN_CACHE_DIR
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# Set tiktoken cache directory before importing tiktoken to ensure
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# tokenizer encodings are cached persistently in the data folder
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os.environ["TIKTOKEN_CACHE_DIR"] = TIKTOKEN_CACHE_DIR
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def token_count(input_string: str) -> int:
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"""
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Count the number of tokens in the input string using the 'o200k_base' encoding.
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Args:
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input_string (str): The input string to count tokens for.
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Returns:
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int: The number of tokens in the input string.
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"""
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try:
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import tiktoken
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encoding = tiktoken.get_encoding("o200k_base")
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tokens = encoding.encode(input_string)
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return len(tokens)
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except (ImportError, OSError) as e:
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# Fallback: handles ImportError (tiktoken not installed) AND network/OS
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# errors such as urllib.error.URLError or ConnectionError raised in
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# offline environments when the encoding file cannot be downloaded.
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from loguru import logger
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logger.warning(
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"tiktoken unavailable, falling back to word-count estimation: {}", e
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)
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return int(len(input_string.split()) * 1.3)
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def token_cost(token_count: int, cost_per_million: float = 0.150) -> float:
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"""
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Calculate the cost of tokens based on the token count and cost per million tokens.
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Args:
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token_count (int): The number of tokens.
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cost_per_million (float): The cost per million tokens. Default is 0.150.
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Returns:
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float: The calculated cost for the given token count.
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"""
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return cost_per_million * (token_count / 1_000_000)
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