Web Reference: Also unlike that Python version, scan() is a JAX primitive and is lowered to a single WhileOp. That makes it useful for reducing compilation times for JIT-compiled functions, since native Python loop constructs in an jit() function are unrolled, leading to large XLA computations. Implement recurrent computations and sequential processing efficiently using lax.scan and understand its interaction with other transformations. Jul 24, 2020 · When you use scanned-over inputs and outputs instead of using the loop carry, it lets JAX generate more efficient differentiation code. The reason is pretty straightforward: we need to save data from each loop iteration for the forward pass to be consumed on the backward pass.
YouTube Excerpt: Do you still loop, append to a list, and stack as an array? That's the application for
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