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Upcast gradually when computing variance #4283

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Upcast gradually when computing variance #4283

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12 changes: 9 additions & 3 deletions lib/Dialect/Torch/Transforms/DecomposeComplexOps.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9322,9 +9322,15 @@ static LogicalResult calculateVariance(OpTy op, PatternRewriter &rewriter,
op, "support floating-point type input only");
}

// Upcasting the input tensor to `F64` dtype for higher precision during the
// computation of the result.
if (inputTensorTy.getDtype().getIntOrFloatBitWidth() != 64) {
// Upcasting the input tensor to a double-bitwidth dtype for higher precision
// during the computation of the result.
unsigned bitwidth = inputTensorTy.getDtype().getIntOrFloatBitWidth();
if (bitwidth != 64) {
Type targetTy = rewriter.getF64Type();
if (bitwidth == 8)
targetTy = rewriter.getBF16Type();
else if (bitwidth == 16)
targetTy = rewriter.getF32Type();
self = convertTensorToDtype(rewriter, loc, self, rewriter.getF64Type());
inputTensorTy = cast<BaseTensorType>(self.getType());
}
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