How many spaces does PEP 8 stipulate that Python's first fine indentation needs to indent?
A and B can only be added if the number of rows and columns of matrix A and matrix B are the same.
Principal Component Analysis (PCA) is a statistical method. A set of variables that may be related to each other is transformed into a set of linearly related variables by orthogonal transformation The converted set of variables is called the principal component
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