title: DEPRECATION WARNING: How to remove tf.keras warning "calling VarianceScaling.__init__ with dtype is deprecated..."
body: <p>The following code generates the warning in tensorflow r1.12 python API:</p>
  
  <pre><code>#!/usr/bin/python3
  import tensorflow as tf
  
  M = tf.keras.models.Sequential();
  M.add(tf.keras.layers.Dense(2)); 
  </code></pre>
  
  <p>The complete warning text is this:</p>
  
  <pre><code>WARNING: Logging before flag parsing goes to stderr.
  W0213 15:50:07.239809 140701996246848 deprecation.py:506] From /home/matias/anaconda3/lib/python3.6/site-packages/tensorflow/python/ops/init_ops.py:1253: calling VarianceScaling.__init__ (from tensorflow.python.ops.init_ops) with dtype is deprecated and will be removed in a future version.
  Instructions for updating:
  Call initializer instance with the dtype argument instead of passing it to the constructor
  </code></pre>
  
  <p>I have tried different approaches like initializing and calling a kernel initializer before adding Dense layer and passing it to Dense constructor, but it seems to not change anything. Is this warning inevitable? A 'yes' as an answer would be enough for me.</p>