Source change (#1023)

* fixed hierarchical clusterization with ward (#998)

Signed-off-by: Daniyal Aliev <daniial.aliev@abbyy.com>
Co-authored-by: Valeriy Fedyunin <valery.fedyunin@abbyy.com>

* master commit

Signed-off-by: daniyalaliev <daniial.aliev@abbyy.com>

* safer source set

Signed-off-by: daniyalaliev <daniial.aliev@abbyy.com>

* kirill's remarks

Signed-off-by: daniyalaliev <daniial.aliev@abbyy.com>

---------

Signed-off-by: Daniyal Aliev <daniial.aliev@abbyy.com>
Signed-off-by: daniyalaliev <daniial.aliev@abbyy.com>
Co-authored-by: Valeriy Fedyunin <valery.fedyunin@abbyy.com>
Co-authored-by: daniyalaliev <daniial.aliev@abbyy.com>

NeoML/src/Dnn/Layers/SourceLayer.cpp

@@ -22,10 +22,7 @@ namespace NeoML {
 
 void CSourceLayer::SetBlob( CDnnBlob* _blob )
 {
-	if( _blob == blob.Ptr() ) {
-		return;
-	}
-
+	bool sameBlob = _blob == blob.Ptr();
 	blob = _blob;
 
 	if( !outputDescs.IsEmpty() ) {
@@ -34,17 +31,20 @@ void CSourceLayer::SetBlob( CDnnBlob* _blob )
 		{
 			outputDescs[0] = blob->GetDesc();
 			ForceReshape();
+		} else {
+			sameBlob = false;
 		}
 	}
 
-	if( !outputBlobs.IsEmpty() ) {
+	if( !outputBlobs.IsEmpty() && !sameBlob ) {
 		outputBlobs[0] = 0;
 	}
 }
 
 void CSourceLayer::Reshape()
 {
 	CheckOutputs();
+	CheckLayerArchitecture( GetInputCount() == 0, "layer must not have inputs" );
 	CheckLayerArchitecture( GetOutputCount() == 1, "Source layer has more than 1 output" );
 	CheckLayerArchitecture( blob.Ptr() != 0, "Source layer has null data blob" );
 	outputDescs[0] = blob->GetDesc();