ValueError: test_size=2 - Fixing Scikit-learn's train_test_split Error

This error occurs when the 'test_size' parameter in scikit-learn's train_test_split function is not set properly.

The 'test_size' parameter determines the size of the test set as a proportion of the total dataset. It can be set as an integer (representing the absolute number of samples in the test set) or as a float (representing the proportion of the total dataset in the test set).

The error message is indicating that 'test_size' has been set to 2, which is either negative or larger than the total number of samples (which is 0). Alternatively, it may have been set to a value outside the (0, 1) range when using a float.

To fix this error, ensure that 'test_size' is set to a valid value, either as an integer or a float in the (0, 1) range.