api: Use bpe singleton for num_tokens_from_messages #114
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There is an underlying issue that leads to memory not freeing up, especially I see it on Linux using
num_tokens_from_messages, which can be observed when calling it multiple times consecutively.See discussion over #39.
One of the optimizations we can make to prevent this constant increase in memory is to use static BPE instances till the underlying issue is resolved. At least now it would take up fixed space for the program lifecycle.