Fix incorrect stats for bf16 params in parameter_overview#380
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uvikas wants to merge 1 commit intogoogle:mainfrom
Open
Fix incorrect stats for bf16 params in parameter_overview#380uvikas wants to merge 1 commit intogoogle:mainfrom
uvikas wants to merge 1 commit intogoogle:mainfrom
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For bfloat16 parameters, accumulating over large tensors produces numerically incorrect results due to bf16 limited precision (~3 significant digits).
A (768,) LayerNorm
scaleinitialized to all 1.0 in bf16 is reported as mean=0.334 std=0.408 instead of mean=1.0 std=0.0. A (768, 768) weight matrix shows ~20x underestimated std.Upcasts arrays to float32 to compute stats. Reported dtype in the overview table remains the original dtype e.g. bfloat16.