M4 meta information
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Other

 Other (seasonality:int=1, horizon:int=8, freq:str='D', name:str='Other',
        n_ts:int=5000, included_groups:Tuple=('Weekly', 'Daily',
        'Hourly'))
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Hourly

 Hourly (seasonality:int=24, horizon:int=48, freq:str='H',
         name:str='Hourly', n_ts:int=414)
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Daily

 Daily (seasonality:int=1, horizon:int=14, freq:str='D', name:str='Daily',
        n_ts:int=4227)
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Weekly

 Weekly (seasonality:int=1, horizon:int=13, freq:str='W',
         name:str='Weekly', n_ts:int=359)
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Monthly

 Monthly (seasonality:int=12, horizon:int=18, freq:str='M',
          name:str='Monthly', n_ts:int=48000)
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Quarterly

 Quarterly (seasonality:int=4, horizon:int=8, freq:str='Q',
            name:str='Quarterly', n_ts:int=24000)
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Yearly

 Yearly (seasonality:int=1, horizon:int=6, freq:str='Y',
         name:str='Yearly', n_ts:int=23000)

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Download data class

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M4

 M4 (source_url:str='https://raw.githubusercontent.com/Mcompetitions/M4-
     methods/master/Dataset/', naive2_forecast_url:str='https://github.com
     /Nixtla/m4-forecasts/raw/master/forecasts/submission-Naive2.zip')

group = 'Hourly'
await M4.async_download('data', group=group)
df, *_ = M4.load(directory='data', group=group)
n_series = len(np.unique(df.unique_id.values))
display_str  = f'Group: {group} '
display_str += f'n_series: {n_series}'
print(display_str)

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Evaluation class

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M4Evaluation

 M4Evaluation ()
Initialize self. See help(type(self)) for accurate signature.

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URL-based evaluation

The method evaluate from the class M4Evaluation can receive a url of a benchmark uploaded to the M4 competiton. The results compared to the on-the-fly evaluation were obtained from the official evaluation. 
from fastcore.test import test_close

esrnn_url = 'https://github.com/Nixtla/m4-forecasts/raw/master/forecasts/submission-118.zip'
esrnn_evaluation = M4Evaluation.evaluate('data', 'Hourly', esrnn_url)
# Test of the same evaluation as the original one
test_close(esrnn_evaluation['SMAPE'].item(), 9.328, eps=1e-3)
test_close(esrnn_evaluation['MASE'].item(), 0.893, eps=1e-3)
test_close(esrnn_evaluation['OWA'].item(), 0.440, eps=1e-3)
esrnn_evaluation

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Numpy-based evaluation

Also the method evaluate can recevie a numpy array of forecasts. 
fforma_url = 'https://github.com/Nixtla/m4-forecasts/raw/master/forecasts/submission-245.zip'
fforma_forecasts = M4Evaluation.load_benchmark('data', 'Hourly', fforma_url)
fforma_evaluation = M4Evaluation.evaluate('data', 'Hourly', fforma_forecasts)
# Test of the same evaluation as the original one
test_close(fforma_evaluation['SMAPE'].item(), 11.506, eps=1e-3)
test_close(fforma_evaluation['MASE'].item(), 0.819, eps=1e-3)
test_close(fforma_evaluation['OWA'].item(), 0.484, eps=1e-3)
fforma_evaluation