refine Layer.cpp for some CostLayer

paddle/gserver/layers/Layer.cpp

@@ -14,7 +14,8 @@ limitations under the License. */
 
 #include "paddle/utils/Util.h"
 
-#include "Layer.h"
+#include "CostLayer.h"
+#include "ValidationLayer.h"
 #include "paddle/math/SparseMatrix.h"
 #include "paddle/utils/Error.h"
 #include "paddle/utils/Logging.h"
@@ -93,6 +94,20 @@ ClassRegistrar<Layer, LayerConfig> Layer::registrar_;
 
 LayerPtr Layer::create(const LayerConfig& config) {
   std::string type = config.type();
+
+  // NOTE: As following types have illegal character '-',
+  // they can not use REGISTER_LAYER to registrar.
+  // Besides, to fit with old training models,
+  // they can not use '_' instead.
+  if (type == "multi-class-cross-entropy")
+    return LayerPtr(new MultiClassCrossEntropy(config));
+  else if (type == "rank-cost")
+    return LayerPtr(new RankingCost(config));
+  else if (type == "auc-validation")
+    return LayerPtr(new AucValidation(config));
+  else if (type == "pnpair-validation")
+    return LayerPtr(new PnpairValidation(config));
+
   return LayerPtr(registrar_.createByType(config.type(), config));
 }