title: Keras GRU input shape
body: <p>I have built a custom generator that outputs X data with shape (100,2,2048) belonging to Y 16 (16) classes to be passed to a GRU model for video classification.</p>
  <p>100 is the sequence length, 2 is for 2 simultaneous camera views, each with 2048 features, extracted earlier with a feature extractor.</p>
  <p>I need to pass this to GRU model, but it throws an error (<code>Input 0 of layer &quot;gru&quot; incompatible with the layer: expected ndim=3, found ndim=4. Sull shape received: (None,100,2,2048)</code>) when I set the input shape in the input layer to (100,2,2048).</p>
  <p>Using just one camera view and setting the it to (100,2048) works.</p>
  <p>What input shape do I need to set to accommodate the two cameras?</p>