Demo: train an MNIST MLP classifier in SQL#196

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alxmrs wants to merge 17 commits into

claude/xarray-sql-autograd-73ovqqfrom

claude/xarray-sql-mnist-demo

Commits on Jun 27, 2026

Add symbolic differentiation engine for SQL expressions (autograd MVP)
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Add Substrait bridge to apply grad() rewrite in the Python context
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Expose grad() in XarrayContext SQL via the Substrait rewrite
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Commits on Jun 28, 2026

Commits on Jun 30, 2026

Differentiate grad() as a SQL rewrite, dropping the Substrait bridge

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Add differentiable-SQL demos: ARCO-ERA5 and gradient descent

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Add MNIST MLP trained in SQL (benchmarks/mnist_mlp.py)

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demo: train the MNIST MLP as one append-only model table

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demo: data-driven deep MLP with the model and metrics as relations

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demo: the whole MLP as one weight relation (bias folded, layer dim)

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