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refactor(burn): symlink overlay — 15K upstream lines → 35 symlinks + 2 files
Replace 11,775 lines of copied upstream burn-ndarray source with: - Git submodule: crates/burn/upstream/ (pinned at ed72d2b) - 35 symlinks: crates/burn/src/*.rs → upstream/crates/burn-ndarray/src/ - 2 real files: ops/tensor.rs (our SIMD wires), ops/activation.rs (fused sigmoid) Our total owned code: 846 lines (801 tensor + 45 activation). Upstream code: 0 lines tracked (lives in submodule). The repo shrinks by ~11K lines while keeping the same functionality. Build: cargo check --manifest-path crates/burn/Cargo.toml Test: cargo test --manifest-path crates/burn/Cargo.toml (30 pass) https://claude.ai/code/session_01Y69Vnw751w75iVSBRws7o7
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‎.gitmodules‎

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[submodule "crates/burn/upstream"]
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path = crates/burn/upstream
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url = https://github.com/tracel-ai/burn.git

‎crates/burn/src/backend.rs‎

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‎crates/burn/src/backend.rs‎

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../upstream/crates/burn-ndarray/src/backend.rs

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