code: public SDVariable reshape(SDVariable x, SDVariable shape) {
          return reshape(null, x, shape);
      }
docs: Reshape the input variable to the specified (dynamic) shape. The output variable will have the same values as the
  input, but with the specified shape.<br>
  Note that prod(shape) must match length(input) == prod(input.shape)
  
  @param x     Input variable
  @param shape New shape for variable
  @return Output variable
  @see #reshape(SDVariable, int[])