Replace keras.engine.topology.Layer with keras.layers.Layer in the API
I suggest that keras.engine should not be part of the official Keras API.
Since `keras.layers.Layer` is the same as `keras.engine.topology.Layer`, it would be simpler to just point the API to the former.
In fact, tf.keras does not have `tensorflow.keras.engine`.
@@ -10,7 +10,7 @@ Here is the skeleton of a Keras layer, **as of Keras 2.0** (if you have an older
```python
from keras import backend as K
-from keras.engine.topology import Layer
+from keras.layers import Layer
class MyLayer(Layer):
@@ -37,7 +37,7 @@ It is also possible to define Keras layers which have multiple input tensors and
```python
from keras import backend as K
-from keras.engine.topology import Layer
+from keras.layers import Layer
class MyLayer(Layer):
