Returns a `Tensor`.

def _get_dense_tensor(self, inputs, weight_collections=None, trainable=None):
    """Returns a `Tensor`."""
    del weight_collections
    text_batch = tf.reshape(inputs.get(self), shape=[-1])
    m = module.Module(self.module_spec, trainable=self.trainable and trainable)
    return m(text_batch)