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tacitdiff's Introduction

TacitDiff

A library for differentiating tacit BQN expressions in different ways.

Currently supported:

  • Symbolic differentiation (by saltysylvi)
  • Tape-based reverse-mode algorithmic differentiation

Planned features:

  • Forward-mode algorithmic differentiation
  • (Accurate) finite differencing

Why do this?

I wanted to learn more about what goes into writing and optimising an autodiff library. I also wanted to challenge myself to come up with a recursive algorithm for generating and evaluating Wengert lists aka gradient tapes. BQN is a very designed language and autodiff fits well into its array programming paradigm. Finally, I just wanted to write something bigger than a few one liners in BQN.

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