nihui opened a new pull request #18955:
URL: https://github.com/apache/incubator-mxnet/pull/18955
The actual code applies epsilon addtion before square root, so fix the math
equation
reference src/operator/instance_norm-inl.h
```
Assign(
out, req[instance_norm::kOut],
broadcast<0>(reshape(repmat(gamma, n), Shape1(n * c)), out.shape_) *
(data - broadcast<0>(mean, data.shape_)) /
F<mshadow_op::square_root>(
broadcast<0>(var + param_.eps, data.shape_)) +
broadcast<0>(reshape(repmat(beta, n), Shape1(n * c)),
out.shape_));
```
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