This question got to do with SMOTEBoost implementation found here but I believe the issue is relayed to imblearn library.

I tried using the library to re-sample all classes in a multiclass problem. Caught by AttributeError: 'int' object has no attribute 'flatten' error:

How to reproduce the error (in Colab nb):

Clone repo:

!git clone https://github.com/gkapatai/MaatPy.git
cd MaatPy/

from maatpy.classifiers import SMOTEBoost

Dummy data:

X, y = make_classification(n_samples=1000, n_classes=3, n_informative=6, weights=[.1, .15, .75])
xtrain, xtest, ytrain, ytest = train_test_split(X, y, test_size=.2, random_state=123)

Create model:

from maatpy.classifiers import SMOTEBoost
model = SMOTEBoost()
model.fit(xtrain, ytrain)

/usr/local/lib/python3.7/dist-packages/imblearn/over_sampling/_smote.py in _make_samples(self, X, y_dtype, y_type, nn_data, nn_num, n_samples, step_size)
    106         random_state = check_random_state(self.random_state)
    107         samples_indices = random_state.randint(
--> 108             low=0, high=len(nn_num.flatten()), size=n_samples)
    109         steps = step_size * random_state.uniform(size=n_samples)
    110         rows = np.floor_divide(samples_indices, nn_num.shape[1])

AttributeError: 'int' object has no attribute 'flatten'

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