[mlpack] 20/35: Add warning for kernel_pca when --output_file is not specified.

[Barak A. Pearlmutter]

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bap pushed a commit to branch master
in repository mlpack.

commit 46a7ffd26400022816a194bef0f09d3a511b9912
Author: Ryan Curtin <ryan at ratml.org>
Date:   Wed Jul 13 17:03:40 2016 -0400

    Add warning for kernel_pca when --output_file is not specified.
    
    Also allow the user to not specify that option.
---
 src/mlpack/methods/kernel_pca/kernel_pca_main.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mlpack/methods/kernel_pca/kernel_pca_main.cpp b/src/mlpack/methods/kernel_pca/kernel_pca_main.cpp
index bac03e5..ae1df30 100644
--- a/src/mlpack/methods/kernel_pca/kernel_pca_main.cpp
+++ b/src/mlpack/methods/kernel_pca/kernel_pca_main.cpp
@@ -153,6 +153,10 @@ int main(int argc, char** argv)
   // Parse command line options.
   CLI::ParseCommandLine(argc, argv);
 
+  if (!CLI::HasParam("output_file"))
+    Log::Warn << "--output_file is not specified; no output will be saved!"
+        << endl;
+
   // Load input dataset.
   mat dataset;
   const string inputFile = CLI::GetParam<string>("input_file");
@@ -243,5 +247,6 @@ int main(int argc, char** argv)
 
   // Save the output dataset.
   const string outputFile = CLI::GetParam<string>("output_file");
-  data::Save(outputFile, dataset, true); // Fatal on failure.
+  if (outputFile != "")
+    data::Save(outputFile, dataset, true); // Fatal on failure.
 }

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