Web Reference: You're using "%s.csv" as the filename, then filename as the array, then finalArray as the format string. So, the problem is that filename is a 0D array (with a string dtype). You probably wanted "%s.csv' % (filename,) as one argument, rather than "%s.csv", filename as two separate arguments. Jul 23, 2025 · This error typically arises when you attempt to create or modify a NumPy array but the data types of the elements you provide don’t align with the expected data type of the array. This guide will thoroughly explain why this dimensionality mismatch occurs, demonstrate how to reproduce it, and provide robust solutions using numpy.reshape() to transform your 3D array into the required 2D shape for compatibility with Scikit-learn estimators.
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