When splitting a dataset, I get an error saying they are empty even though they don't seem empty [closed]

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开发者_如何学编程 Improve this question

This is the code I'm trying to run:

X = df.iloc[:, 0:-1]
y = df.iloc[:, -1]
X_train, X_test, y_train, y_test = train_test_split(X, y,test_size=0.20, train_size = 0.80)

And this is the error I am getting.

ValueError: With n_samples=0, test_size=0.2 and train_size=0.8, the resulting train set will be empty. Adjust any of the aforementioned parameters.

The target attribute is assumed to be the last one and I'm writing a function that takes a dataset as input and returns the best-performing model from a list of models.

I printed X and y separately but neither of them is empty.