How to turn a Pandas column into array and transpose it?

Another way would be to reshape your array to shape (-1,1), which means "infer number of rows, force to 1 column":

Y_train = np.array(training_set['label']).reshape(-1,1)

One way:

Y_train = training_set['label'].values[:, None]

Use DataFrame.to_numpy(), the new Right Way to extract a numpy array:

training_set[['label']].to_numpy()

pandas < 0.24

Slice out your column as a single columned DataFrame (using [[...]]), not as a Series:

Y_train = np.asarray(training_set[['label']])

Or,

Y_train = training_set[['label']].values

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