I saved 2 CSR matrices on the disk in .npy format. For running the classifier, I need to merge the CSR matrices. How can I concatenate CSR2 to CSR1?

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The sparse library has **hstack** and **vstack** for concatenating matrices horizontally and vertically respectively. Look at the following code for the reference.

from scipy import sparse

data1 = np.load('filename1.npy').tolist()

data2 = np.load('filename2.npy').tolist()

merged_data = sparse.vstack((data1,data2), format='csr') #merge the data

The above code will generate the merged data in CSR format.