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Non-deterministic behavior in SimLingo/bench2drive despite disabling LoRA dropout #93

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@satabios

I have set up bench2drive and am running routes on SimLingo. I noticed that route and speed predictions vary across runs even with identical inputs.

I performed a deep inspection and found that all modules exhibit deterministic behavior up until the final call: features, logits = self.language_model.forward(input_embed_concat)

Suspecting that the LoRA (PEFT) dropout was introducing stochasticity, I replaced the dropout layers with nn.Identity. However, the output of the language model remains non-deterministic during the final pass.

Aside from dropout, are there other potential sources of randomness in the LLM forward pass I should investigate to enforce strict determinism?

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