Update src/mlpack/methods/ann/layer/c_relu_impl.hpp

Co-authored-by: Ryan Curtin <ryan@ratml.org>

src/mlpack/methods/ann/layer/c_relu_impl.hpp

@@ -87,10 +87,12 @@ void CReLUType<MatType>::Backward(
     const MatType& gy,
     MatType& g)
 {
-  // while it doesn't really matter if what we choose for the gradient at exactly 0, since we have the
-  // discontinuity from -1 to 1 between 0- and 0+, it seems cleaner to set the gradient at x=0 to 0
-  // instead of picking either +1 or -1.
-  g = gy.rows(0, input.n_rows-1) % (input > 0) - gy.rows(input.n_rows, input.n_rows * 2 - 1) % (input < 0);
+  // While it doesn't really matter if what we choose for the gradient at
+  // exactly 0, since we have the discontinuity from -1 to 1 between 0- and 0+,
+  // it seems cleaner to set the gradient at x=0 to 0 instead of picking either
+  // +1 or -1.
+  g = gy.rows(0, input.n_rows - 1) % (input > 0) -
+      gy.rows(input.n_rows, input.n_rows * 2 - 1) % (input < 0);
 }
 
 template<typename MatType>