title: TensorFlow with keras: Where is the ReLU layer in tf version 1.8?
body: <p>Update: Found it: The class is <a href="https://www.tensorflow.org/api_docs/python/tf/keras/layers/Activation#__init__" rel="nofollow noreferrer">tf.keras.layers.Activation</a>; needs to be called with argument activation='relu'....</p>
  
  <hr>
  
  <p>Trying to access tf.keras.layers.ReLU gives the error:</p>
  
  <blockquote>
    <p>AttributeError: module
    'tensorflow.tools.api.generator.api.keras.layers' has no attribute
    'ReLU'.</p>
  </blockquote>
  
  <p>In the docs, version <a href="https://www.tensorflow.org/versions/master/api_docs/python/tf/keras/layers/ReLU" rel="nofollow noreferrer">master</a> has such a layer. Version 1.8 (and 1.9) only seems to have leaky relu, PReLU, and other derivatives. </p>
  
  <p>Right now I'm using <a href="https://www.tensorflow.org/versions/r1.8/api_docs/python/tf/keras/layers/ThresholdedReLU" rel="nofollow noreferrer">ThresholdedReLU</a> with theta of 0.0, I hope this results in a standard ReLU. But there must be a simple 'ReLU' layer as well?</p>
  
  <p>Where can I find keras' ReLU layer in tensorflow 1.8?
  I want a keras layer class, i.e., not <a href="https://www.tensorflow.org/versions/r1.8/api_docs/python/tf/keras/backend/relu" rel="nofollow noreferrer">tf.keras.backend.relu</a>.</p>
  
  <p>It feels as if I'm overlooking something completely obvious. I haven't used keras before, so, sorry if this is a super stupid question.</p>