Problem in compute_dataset_statistics

[toncho11]

I am getting the error below when uisng the benchmark. It seems the error is in: compute_dataset_statistics()

Zhou2016-WithinSession: 100%|██████████| 4/4 [00:46<00:00, 11.55s/it]
Traceback (most recent call last):

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
    exec(code, globals, locals)

  File c:\work\pythoncode\ml_examples\eeg\mdm-mf\article_comparison_default_metric_vs_power_metric_moabb.py:65
    results = benchmark(

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\moabb\benchmark.py:225 in benchmark
    _save_results(eval_results, output, plot)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\moabb\benchmark.py:302 in _save_results
    analyze(prdgm_result, str(prdgm_path), plot=plot)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\moabb\analysis\__init__.py:61 in analyze
    stats = compute_dataset_statistics(results)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\moabb\analysis\meta_analysis.py:237 in compute_dataset_statistics
    p = compute_pvals_wilcoxon(score_data, algs)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\moabb\analysis\meta_analysis.py:66 in compute_pvals_wilcoxon
    p = stats.wilcoxon(df.loc[:, pipe1], df.loc[:, pipe2])[1]

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\scipy\_lib\_util.py:798 in wrapper
    return fun(*args, **kwargs)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\scipy\stats\_axis_nan_policy.py:573 in axis_nan_policy_wrapper
    res = hypotest_fun_out(*samples, **kwds)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\scipy\stats\_morestats.py:4129 in wilcoxon
    return _wilcoxon._wilcoxon_nd(x, y, zero_method, correction, alternative,

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\scipy\stats\_wilcoxon.py:199 in _wilcoxon_nd
    temp = _wilcoxon_iv(x, y, zero_method, correction, alternative, method, axis)

  File C:\Work\PythonCode\envs\eeg3_p310\lib\site-packages\scipy\stats\_wilcoxon.py:125 in _wilcoxon_iv
    raise ValueError("zero_method 'wilcox' and 'pratt' do not "

ValueError: zero_method 'wilcox' and 'pratt' do not work if x - y is zero for all elements.

[sylvchev]

I could not reproduce this. Is this an error from the results agregation?