Add new datasets to darts.dataset

[FEJTWOW]

Fixes #617.

Summary

• Add new dataset to dataset catalog
• Specify the class in darts.datasets.__init__.py to correctly load new dataset

[codecov-commenter]

Codecov Report

Base: 93.84% // Head: 93.83% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (bfb54e9) compared to base (d466815).
Patch coverage: 20.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1298      +/-   ##
==========================================
- Coverage   93.84%   93.83%   -0.01%     
==========================================
  Files          78       78              
  Lines        8500     8488      -12     
==========================================
- Hits         7977     7965      -12     
  Misses        523      523              

Impacted Files	Coverage Δ
darts/datasets/dataset_loaders.py	91.48% <20.00%> (ø)
darts/timeseries.py	92.29% <0.00%> (-0.06%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	87.08% <0.00%> (-0.06%)	⬇️
darts/models/forecasting/block_rnn_model.py	98.24% <0.00%> (-0.04%)	⬇️
darts/models/forecasting/nhits.py	99.27% <0.00%> (-0.01%)	⬇️

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[gdevos010]

@FEJTWOW Thanks for adding a new dataset. I know many other repos have used this dataset for benchmarking. I believe Autoformer started using it. Are the time ranges the same? And if there not, can we add an arg to match it?

[FEJTWOW]

@FEJTWOW Thanks for adding a new dataset. I know many other repos have used this dataset for benchmarking. I believe Autoformer started using it. Are the time ranges the same? And if there not, can we add an arg to match it?

@gdevos010 Can you specify what do you mean by time ranges. Do you want to specify the start date and end date or do you want to have an arg to specify the day of the week? For instance right now I've assumed that the data was updated every week on Sunday at 00:00:00, but it is possible to change the day while parsing.

I've checked this dataset and their data covers time from 2002-01-01 to 2020-06-30. The dataset that I've just added covers data from 1997-10-12 to 2022-10-09. If you want to change your start day you can always do TimeSeries.drop_before()

[hrzn]

@FEJTWOW Thanks for adding a new dataset. I know many other repos have used this dataset for benchmarking. I believe Autoformer started using it. Are the time ranges the same? And if there not, can we add an arg to match it?

I think it'd be overkill to add supporting time ranges here, as IMO it would mix concerns quite a bit.
Users could just do for instance: my_ts = WeatherDataset().load()[pd.Timestamp("2020-06-01T00:10:00"):].

[hrzn]

Looks good @FEJTWOW ! I've added a few comments.
Regarding the traffic CSV file: it's quite big (100 MB). Could you check whether it could be better to use git large files for this one?

[hrzn]

LGTM, nice work @FEJTWOW