A minor fix in the CTF reader

Make the reader skip over extra inputs even when their name exceeds
  the maximum expected input name length.

Source/Readers/CNTKTextFormatReader/TextParser.cpp

@@ -697,13 +697,16 @@ bool TextParser<ElemType>::TryGetInputId(size_t& id, size_t& bytesToRead)
         {
             // the current string length is already equal to the maximum expected length,
             // yet it's not followed by a delimiter.
-            if (ShouldWarn())
+            if (m_traceLevel >= Info)
             {
+                string namePrefix(m_scratch.get(), m_maxAliasLength);
                 fprintf(stderr,
-                    "WARNING: Did not find a valid input name %ls.\n",
-                    GetFileInfo().c_str());
+                    "INFO: Skipping unknown input %ls. "
+                    "Input name (with the %" PRIu64 "-character prefix '%s') "
+                    "exceeds the maximum expected length (%" PRIu64 ").\n",
+                    GetFileInfo().c_str(), m_maxAliasLength, namePrefix.c_str(), m_maxAliasLength);
             }
-            break;
+            return false;
         }
 
         ++m_pos;

Tests/UnitTests/ReaderTests/CNTKTextFormatReaderTests.cpp

@@ -698,7 +698,30 @@ BOOST_AUTO_TEST_CASE(CNTKTextFormatReader_no_trailing_newline_invalid_input)
                 " while reading the input file (no_trailing_newline.txt).") == ex.what();
         });;
     }
+};
 
+
+BOOST_AUTO_TEST_CASE(CNTKTextFormatReader_extra_input_should_be_ignored)
+{
+    vector<StreamDescriptor> streams(1);
+    streams[0].m_alias = "A";
+    streams[0].m_name = L"A";
+    streams[0].m_storageType = StorageType::dense;
+    streams[0].m_sampleDimension = 1;
+
+    string filename = "extra_input.txt";
+
+    for (auto& input : { "|A 1 |B 1 2 3", "|A 2 |this_input_is_supposed_to_be_also_ignored 1 2 3" })
+    {
+        {
+            boost::filesystem::remove(filename);
+            std::ofstream file;
+            file.open(filename, std::ofstream::out);
+            file << input;
+        }
+        CNTKTextFormatReaderTestRunner<double> testRunner(filename, streams, 0);
+        testRunner.LoadChunk();
+    }
 };
 
 // 100 sequences with N samples for each of 3 inputs, where N is chosen at random