def put_image(self, name, val):
        """
        Put an image.

        Args:
            name (str):
            val (np.ndarray): 2D, 3D (HWC) or 4D (NHWC) numpy array of images
                in range [0,255]. If channel is 3, assumed to be RGB.
        """
        assert isinstance(val, np.ndarray)
        arr = image_to_nhwc(val)
        self._dispatch(lambda m: m.process_image(name, arr))
        s = create_image_summary(name, arr)
        self._dispatch(lambda m: m.process_summary(s))
Put an image.

        Args:
            name (str):
            val (np.ndarray): 2D, 3D (HWC) or 4D (NHWC) numpy array of images
                in range [0,255]. If channel is 3, assumed to be RGB.