Orientation of y-axis in Heatmap

The default orientation of the y-axis in the Heatmap graph is, at least to me, unexpected. The 0,0 coordinate of the plot is in the lower left corner. A heatmap is generally used to display a matrix, such as an image, however, and the 0,0 index into the matrix would be in the top left corner. An image is thus displayed flipped upside down. One can of course flip the z array or provide the values for y in reversed order, but this keeps the labelling of the axis and the display of y,x in the hover window unaffected. I like the way this is handled in matplotlib.pyplot.imshow, which provides an origin argument.
An additional argument for the Heatmap graph to control the orientation of the y-axis would be nice.

从 Heatmap 图表的入口点开始，检查其 y 轴和悬停标签的处理方式；将所需行为与 matplotlib.pyplot.imshow 的 origin 参数进行比较。当可选的 orientation 参数能够控制显示的 y 方向，同时轴标签和悬停坐标保持一致，并且覆盖两种方向时，即视为完成。