[8/8] feat: add INT4 fake QAT for MoE grouped linear - #9
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yueming-yuan
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Feb 18, 2026
yueming-yuan
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- Add _FakeInt4QuantizationSTE autograd function with STE backward
- Add fake_int4_quantization_ste helper preserving main_grad
- Override TEGroupedLinear._get_weight_tensors for fake QAT
- Controlled via env vars: OPEN_TRAINING_INT4_FAKE_QAT_FLAG, OPEN_TRAINING_INT4_GROUP_SIZE
Add fake INT4 QAT support for TEGroupedLinear (MoE expert weights). When OPEN_TRAINING_INT4_FAKE_QAT_FLAG=1, weights are quantized to INT4 and dequantized with STE (Straight-Through Estimator) during forward pass. Group size controlled via OPEN_TRAINING_INT4_GROUP_SIZE. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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fzyzcjy
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Feb 19, 2026
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LGTM after offline sync (adding all of them is equiv to .patch)
guapisolo
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Feb 26, 2026
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Yueming Yuan <yym022502@gmail.com>
guapisolo
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Mar 2, 2026
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Yueming Yuan <yym022502@gmail.com>
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