javelinjs commented on a change in pull request #8759: image flip op
URL: https://github.com/apache/incubator-mxnet/pull/8759#discussion_r152729081
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File path: src/operator/image/image_random-inl.h
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@@ -144,6 +151,45 @@ static void Normalize(const nnvm::NodeAttrs &attrs,
});
}
+inline static int FlipIndex(int idx, const int stride, const int trailing) {
+ const int low = idx % trailing;
+ int high = idx / trailing;
+ const int x = high % stride;
+ high /= stride;
+
+ return (high * stride + stride - 1 - x) * trailing + low;
+}
+
+template<typename DType>
+static void FlipImpl(const int size, DType *src, DType *dst,
+ const int stride, const int trailing) {
+ for (int idx = 0; idx < size; ++idx) {
+ int new_idx = FlipIndex(idx, stride, trailing);
Review comment:
how's it now?
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