better print of some ops.

theano/tensor/basic.py

@@ -1168,6 +1168,8 @@ class ScalarFromTensor(Op):
         out[0] = s.flatten()[0]
     def grad(self, (s,), (dt,)):
         return [TensorFromScalar(dt)]
+    def __str__(self):
+        return self.__class__.__name__
 scalar_from_tensor = ScalarFromTensor()
 
 

theano/tensor/blas.py

@@ -71,6 +71,8 @@ class GemmRelated(Op):
         return (type(self) == type(other))
     def __hash__(self):
         return hash(type(self))
+    def __str__(self):
+        return self.__class__.__name__
     def c_support_code(self):
         #return cblas_header_text()
         mod_str = """

theano/tensor/nnet/nnet.py

@@ -495,7 +495,8 @@ class CrossentropySoftmaxArgmax1HotWithBias(gof.Op):
         return type(self) == type(other)
     def __hash__(self):
         return tensor.hashtype(self)
-
+    def __str__(self):
+        return self.__class__.__name__
     def make_node(self, x, b, y_idx):
         x = tensor.as_tensor_variable(x)
         b = tensor.as_tensor_variable(b)
@@ -673,6 +674,8 @@ class CrossentropySoftmax1HotWithBiasDx (gof.Op):
         return type(self) == type(other)
     def __hash__(self):
         return tensor.hashtype(self)
+    def __str__(self):
+        return self.__class__.__name__
     def make_node(self, dy, sm, y_idx,**kwargs):
         dy = tensor.as_tensor_variable(dy)
         sm = tensor.as_tensor_variable(sm)