code: def parameters(self, value):
          
          self.W = value[0] if isinstance(value[0], GPUArray) else \
            gpuarray.to_gpu(value[0])
          self.b = value[1] if isinstance(value[0], GPUArray) else \
            gpuarray.to_gpu(value[1])
docs: Update the parameters. ``value`` must have the shape
          ``(weights, biases)``