Web Reference: Aug 13, 2025 · Scikit-learn's LinearRegression expects the input features (X) to be a 2D array of shape (n_samples, n_features), even for a simple linear regression with one feature (i.e., a single x variable predicting y). Feb 15, 2024 · In Python, the Expected 2D array got a 1D array instead error occurs when we are passing a 1-dimensional array in a function but the function requires 2-dimensional array, so instead of passing a 2D array, we are passing Array with Single Dimension. Apr 11, 2024 · The Python "ValueError: Expected 2D array, got 1D array instead" occurs when you pass a 1-dimensional array to a function that expects a 2-dimensional array. To solve the error, reshape the numpy.reshape() method to make the array two-dimensional.
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