added proper error message if model name is not right

pytorch_widedeep/initializers.py

@@ -25,9 +25,9 @@ class MultipleInitializers(object):
 			try:
 				child.apply(self._initializers[model_name])
 			except KeyError:
-			    warnings.warn(
+			    raise ValueError(
 			    	'Model name has to be one of: {}'.format(str([child.__class__.__name__.lower()
-			    		for child in children])), ValueError)
+			    		for child in children])))
 
 class Normal(Initializer):
 

pytorch_widedeep/optimizers.py

@@ -23,9 +23,9 @@ class MultipleOptimizers(object):
 			try:
 				self._optimizers[model_name] = self._optimizers[model_name](child)
 			except KeyError:
-			    warnings.warn(
+			    raise ValueError(
 			    	'Model name has to be one of: {}'.format(str([child.__class__.__name__.lower()
-			    		for child in children])), ValueError)
+			    		for child in children])))
 
 	def zero_grad(self):
 	    for _, opt in self._optimizers.items():