pos2vel() broken with GazeBase

[dkrako]

Current Behavior

There's a type error in a polars computation.
Maybe there's an operation that gets accidentally a column string?
Or the nesting didn't work properly?
Or there's something strange with the default values?

(base) user3@ift-dgx:~/lab/pymovements                                                                                                                                                                          $ cat t.py
import pymovements as pm                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           dataset = pm.Dataset('GazeBase', path='data/GazeBase')                                                                                                                                                           dataset.download()                                                                                                                                                                                               dataset.load()                                                                                                                                                                                                   dataset.pos2vel()

(base) user3@ift-dgx:~/lab/pymovements                                                                                                                                                                          $ pip install --user --upgrade pymovements                                                                                                                                                                       Looking in indexes: https://pypi.org/simple, https://packagecloud.io/github/git-lfs/pypi/simple                                                                                                                  Requirement already satisfied: pymovements in /home/user3/.local/lib/python3.9/site-packages (0.16.1.post0+git.47e29b71.dirty) 

(base) user3@ift-dgx:~/lab/pymovements
$ python t.py
Downloading https://figshare.com/ndownloader/files/27039812 to data/GazeBase/downloads/GazeBase_v2_0.zip
GazeBase_v2_0.zip: 100%|█████████████████████████████████████████████| 6.25G/6.25G [03:20<00:00, 33.4MB/s]
Checking integrity of GazeBase_v2_0.zip
Extracting GazeBase_v2_0.zip to data/GazeBase/raw
100%|███████████████████████████████████████████████████████████████| 12334/12334 [08:12<00:00, 25.02it/s]  
0%|                                                                  | 22/12334 [00:01<12:45, 16.09it/s]
Traceback (most recent call last):
  File "/home/user3/lab/pymovements/t.py", line 7, in <module>
    dataset.pos2vel()
  File "/home/user3/lab/pymovements/src/pymovements/dataset/dataset.py", line 355, in pos2vel
    gaze_df.pos2vel(method=method, **kwargs)
  File "/home/user3/lab/pymovements/src/pymovements/gaze/gaze_dataframe.py", line 373, in pos2vel
    self.transform('pos2vel', method=method, **kwargs)
  File "/home/user3/lab/pymovements/src/pymovements/gaze/gaze_dataframe.py", line 298, in transform
    [
  File "/home/user3/lab/pymovements/src/pymovements/gaze/gaze_dataframe.py", line 299, in <listcomp>
    df.with_columns(transform_method(**kwargs))
  File "/home/user3/.local/lib/python3.9/site-packages/polars/dataframe/frame.py", line 7631, in with_columns
    self.lazy()
  File "/home/user3/.local/lib/python3.9/site-packages/polars/utils/deprecation.py", line 93, in wrapper
    return function(*args, **kwargs)
  File "/home/user3/.local/lib/python3.9/site-packages/polars/lazyframe/frame.py", line 1695, in collect
    return wrap_df(ldf.collect())
exceptions.ComputeError: arithmetic on string and numeric not allowed, try an explicit cast first

Context

• Project Version / Commit: v0.16.1
• Operating System: linux

[dkrako]

fixed with #593