René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: call cmap object on torch.tensor will output first element all 0","articleBody":"### Bug summary\n\nWhen I create camp object and call on torch.tensor, it output result with first element be all 0. But if I call tensor.numpy() explicity, everything went well. I do not know this is a problem of matplotlib or problem of pytorch.\n\n### Code for reproduction\n\n```python\nimport torch\r\nfrom matplotlib import cm\r\n\r\ncmap = cm.get_cmap(\"plasma\")\r\ni_tensor = abs(torch.randn([3,5,5]))\r\ni_tensor = i_tensor/i_tensor.max()\r\ni_numpy = i_tensor.numpy()\r\nc_ts = cmap(i_tensor)[...,:3]\r\nc_np = cmap(i_numpy)[...,:3]\r\nprint(c_ts[0])\r\nprint(c_np[0])\n```\n\n\n### Actual outcome\n\n[[[0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]]\r\n\r\n [[0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]]\r\n\r\n [[0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]]\r\n\r\n [[0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]]\r\n\r\n [[0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]\r\n  [0. 0. 0.]]]\n\n### Expected outcome\n\nwith specific value\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.3.4\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\n_No response_","author":{"url":"https://github.com/yugeng-tju","@type":"Person","name":"yugeng-tju"},"datePublished":"2022-05-25T03:39:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/23132/matplotlib/issues/23132"}