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Python installation does not work when calling fit #8

Description

@mrektor

Hi,

After the installation of the dependencies and of the python library, when calling the fit method (executing the code from the example.py) it gives this error:

Traceback (most recent call last):
  File "example.py", line 17, in <module>
    model.fit(X, y)
  File "/home/ettore.mariotti/Documents/gosdt_repo/GeneralizedOptimalSparseDecisionTrees/python/model/gosdt.py", line 99, in fit
    self.__train__(X, y)
  File "/home/ettore.mariotti/Documents/gosdt_repo/GeneralizedOptimalSparseDecisionTrees/python/model/gosdt.py", line 48, in __train__
    dataset.insert(m, "class", y) # It is expected that the last column is the label column
  File "/home/ettore.mariotti/.local/lib/python3.8/site-packages/pandas/core/frame.py", line 4418, in insert
    value = self._sanitize_column(value)
  File "/home/ettore.mariotti/.local/lib/python3.8/site-packages/pandas/core/frame.py", line 4510, in _sanitize_column
    return sanitize_array(value, self.index, copy=True, allow_2d=True)
  File "/home/ettore.mariotti/.local/lib/python3.8/site-packages/pandas/core/construction.py", line 571, in sanitize_array
    subarr = maybe_convert_platform(data)
  File "/home/ettore.mariotti/.local/lib/python3.8/site-packages/pandas/core/dtypes/cast.py", line 126, in maybe_convert_platform
    arr = lib.maybe_convert_objects(arr)
  File "pandas/_libs/lib.pyx", line 2385, in pandas._libs.lib.maybe_convert_objects
ValueError: Buffer has wrong number of dimensions (expected 1, got 2)

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