Merge pull request #3733 from shrit/fix_const

Fix the warning from the additional const

src/mlpack/core/kernels/cauchy_kernel.hpp

@@ -77,7 +77,7 @@ class CauchyKernel
   }
 
   // Get the kernel bandwidth.
-  const double Bandwidth() const { return bandwidth; }
+  double Bandwidth() const { return bandwidth; }
   // Modify the kernel bandwidth.
   void Bandwidth(const double bw) { this->bandwidth = bw; }
 

src/mlpack/core/kernels/epanechnikov_kernel.hpp

@@ -71,7 +71,7 @@ class EpanechnikovKernel
   inline double Normalizer(const size_t dimension);
 
   // Get the bandwidth of the kernel.
-  const double Bandwidth() const { return bandwidth; }
+  double Bandwidth() const { return bandwidth; }
   // Modify the bandwidth of the kernel.
   void Bandwidth(const double bandwidth)
   {

src/mlpack/core/kernels/spherical_kernel.hpp

@@ -30,7 +30,7 @@ class SphericalKernel
   { /* Nothing to do. */ }
 
   // Get the bandwidth.
-  const double Bandwidth() const { return bandwidth; }
+  double Bandwidth() const { return bandwidth; }
   // Modify the bandwidth.
   void Bandwidth(const double bandwidth)
   {