title: How many neurons are there in first layer of tensorflow model?
body: <p>Let's take example of standard MNIST example give on </p>
  
  <pre><code>www.tensorflow.com
  </code></pre>
  
  <p>Where there are <code>28*28</code> X parameters for a single image and <code>100,000</code> images.</p>
  
  <p>Then how to determine number of neurons in first layer if I am usins simplistic neural network with no hidden layers.</p>
  
  <p>Thanks.</p>
  
  <p>PS: new to TF</p>