def cal_eigenvalue(cov):
"""calculate eigenvalue of `cov` matrix"""
eigenvalues, eigenvectors = np.linalg.eig(cov)
eigen_dict = {value: idx for idx, value in enumerate(eigenvalues)}
sort_handler = Sort()
sort_eigenvalues = sort_handler.quick(eigenvalues)
sort_eigenvalues = sort_eigenvalues[::-1]
sort_eigenvectors = [eigenvectors[eigen_dict[sort_value]] for sort_value in sort_eigenvalues]
return sort_eigenvalues, sort_eigenvectors
def get_reverse_seq_num(reverse_lst):
"""get the reverse order number"""
num = len(reverse_lst)
# map lst to minist range
sort_handler = Sort()
sort_lst = sort_handler.quick(reverse_lst.copy())
sort_lst_dct = {item: i for i, item in enumerate(sort_lst)}
insert_lst = [sort_lst_dct[item] for item in reverse_lst]
# count
new_lst = [0] * num
reverse_num = 0
for item in insert_lst:
reverse_num += new_lst[item]
for i in range(item):
new_lst[i] += 1
return reverse_num