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liangz1
This PR fixes the data downloading issue in the example code.
Reproduce: On a cluster with multiple GPUs per worker node, with spark.resources.tasks.gpu.amount set to 1, running the original example will trigger an error related to data downloading.
Cause: There will be multiple tasks running on the same worker and each task will try to write the data to the same path, which will corrupt the data.
Fix: Randomize the file path.