Update README.md and setup.py.

README.md

@@ -112,37 +112,44 @@ In the [examples folder](https://github.com/fchollet/keras/tree/master/examples)
 
 ## Installation
 
-Keras uses the following dependencies:
+Before installing Keras, please install one of its backend engines: TensorFlow, Theano, or CNTK. We recommend the TensorFlow backend.
 
-- numpy, scipy
-- yaml
-- HDF5 and h5py (optional, required if you use model saving/loading functions)
-- Optional but recommended if you use CNNs: cuDNN.
+- [TensorFlow installation instructions](https://www.tensorflow.org/install/).
+- [Theano installation instructions](http://deeplearning.net/software/theano/install.html#install).
+- [CNTK installation instructions](https://docs.microsoft.com/en-us/cognitive-toolkit/setup-cntk-on-your-machine).
 
+You may also consider installing the following **optional dependencies**:
 
-*When using the TensorFlow backend:*
+- cuDNN (recommended if you plan on running Keras on GPU).
+- HDF5 and h5py (required if you plan on saving Keras models to disk).
+- graphviz and pydot (used by [visualization utilities](https://keras.io/visualization/) to plot model graphs).
 
-- TensorFlow
-    - [See installation instructions](https://www.tensorflow.org/install/).
+Then, you can install Keras itself. There are two ways to install Keras:
 
-*When using the CNTK backend:*
+- **Install Keras from PyPI (recommended):**
 
-- CNTK
-    - [See installation instructions](https://docs.microsoft.com/en-us/cognitive-toolkit/setup-cntk-on-your-machine).
+```sh
+sudo pip install keras
+```
+
+If you are using a virtualenv, you may want to avoid using sudo:
+
+```sh
+pip install keras
+```
 
-*When using the Theano backend:*
+- **Alternatively: install Keras from the Github source:**
 
-- Theano
-    - [See installation instructions](http://deeplearning.net/software/theano/install.html#install).
+First, clone Keras using `git`:
 
-To install Keras, `cd` to the Keras folder and run the install command:
 ```sh
-sudo python setup.py install
+git clone https://github.com/fchollet/keras.git
 ```
 
-You can also install Keras from PyPI:
+ Then, `cd` to the Keras folder and run the install command:
 ```sh
-sudo pip install keras
+cd keras
+sudo python setup.py install
 ```
 
 ------------------

setup.py

@@ -10,7 +10,10 @@
       url='https://github.com/fchollet/keras',
       download_url='https://github.com/fchollet/keras/tarball/2.0.7',
       license='MIT',
-      install_requires=['theano', 'pyyaml', 'six'],
+      install_requires=['numpy>=1.9.1',
+                        'scipy>=0.14',
+                        'six>=1.9.0',
+                        'pyyaml'],
       extras_require={
           'h5py': ['h5py'],
           'visualize': ['pydot>=1.2.0'],