rescale log-norm scRNAseq counts back to raw

get_raw.py

import scipy.sparse as sp
import numpy as np

def get_raw(adata):
    X = adata.X
    if not sp.isspmatrix_csr(X):
        raise Exception("matrix needs to be in csr format")
    if is_integer_vector(adata.X[0,:].data):
        raise Exception("matrix is already in integer format")
    row_mins = np.minimum.reduceat(X.data, X.indptr[:-1])
    X.data /= np.repeat(row_mins, np.diff(X.indptr))
    adata.X.data=np.round(X.data).astype(int)