Lists of arrays with varying numbers of elements should not be converted into numpy arrays

[francescopisu]

Is your proposal related to a problem?

Trying to create a numpy array from a list of arrays with varying number of elements results in a ValueError.

See stack trace:

ValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (20,) + inhomogeneous part.

Describe the solution you'd like

The following attributes of CVModellingOutput should be lists instead:

• gts_train
• gts_val
• probas_train
• probas_val
• errors
• correct
• features

Describe alternatives you've considered

N.A.

Additional context