Use float32 scale in AutoScale MNIST training example.
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In some configurations, `float16` does not have enough dynamic range to represent scaling, meaning the scale factor can quickly overflow. Using `float32` (or equivalently `bfloat16`) should allow a bit more margin.
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In some configurations,
float16does not have enough dynamic range to represent scaling, meaning the scale factor can quickly overflow. Usingfloat32(or equivalentlybfloat16) should allow a bit more margin.