[BUG] Data Leakage in Testing Phase

[puja-urmi]

In the testing script located at "examples/advanced/brats18/result_stat/brats_3d_test_only.py"

The script uses site-All.json to locate test cases. However, some cases in site-All.json overlap with site-4.json, which was already used during training. Testing on previously seen data inflates performance metrics. So, the reported test results do not accurately measure the model's ability to segment truly unseen data.

I think modifying site-All.json to exclude cases used before, or use a separate dataset for testing that was never seen during training or validation will provide true result. Thank you

[ZiyueXu77]

Thanks for the suggestion! We will update the Brats example