Added and Fixed ValueError for plot_model, model_to_dot, and model.summary()

keras/engine/training.py

@@ -2535,10 +2535,8 @@ class Model(base_layer.Layer, version_utils.ModelVersionSelector):
     """
     if not self.built:
       raise ValueError('This model has not yet been built. '
-                       'Build the model first by calling `build()` or calling '
-                       '`fit()` with some data, or specify '
-                       'an `input_shape` argument in the first layer(s) for '
-                       'automatic build.')
+                       'Build the model first by calling `build()` or by calling '
+                       'the model on a batch of data.')
     layer_utils.print_summary(
         self,
         line_length=line_length,

keras/utils/vis_utils.py

@@ -135,8 +135,15 @@ def model_to_dot(model,
     `subgraph=True`.
 
   Raises:
+    ValueError: if `model_to_dot` is called before the model is built.
     ImportError: if graphviz or pydot are not available.
   """
+
+  if not model.built:
+    raise ValueError('This model has not yet been built. '
+                     'Build the model first by calling `build()` or by calling '
+                     'the model on a batch of data.')
+
   from keras.layers import wrappers
   from keras.engine import sequential
   from keras.engine import functional
@@ -394,10 +401,19 @@ def plot_model(model,
     show_layer_activations: Display layer activations (only for layers that
       have an `activation` property).
 
+  Raises:
+    ValueError: if `plot_model` is called before the model is built.
+
   Returns:
     A Jupyter notebook Image object if Jupyter is installed.
     This enables in-line display of the model plots in notebooks.
   """
+
+  if not model.built:
+    raise ValueError('This model has not yet been built. '
+                     'Build the model first by calling `build()` or by calling '
+                     'the model on a batch of data.')
+
   dot = model_to_dot(
       model,
       show_shapes=show_shapes,