Lightning-AI/lightning-thunder

Support `torch.where(condition)` with thunder.jit

Aperta

#124 aperta il 3 apr 2024

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Descrizione

🚀 Feature

Motivation

Mixtral uses it: https://github.com/mistralai/mistral-src/blob/8598cf582091a596671be31990448e0620017851/moe_one_file_ref.py#L215

Minimal Repro

import thunder

def fn(cond):
    return torch.where(cond)

thunder.jit(fn)(torch.randn(3) > 0)

Pitch

Support image from https://pytorch.org/docs/stable/generated/torch.where.html

Additional context

We already support torch.where(condition, input, other): https://github.com/search?q=repo%3ALightning-AI%2Flightning-thunder+%22def+where%22&type=code

cc @apaz-cli

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