bug: TypeError in unsupported operand type(s) for ** or pow(): numpy.ndarray and Tensor

[tan90xx]

diffsptk/diffsptk/misc/utils.py

Line 137 in 053d888

def get_alpha(sr, mode="hts", n_freq=10, n_alpha=100):

diffsptk/diffsptk/modules/freqt.py

Line 106 in 053d888

A[0, :] = alpha**arange

When mode="auto", get_alpha returned a numpy.ndarray, which does not support operations with Tensor. In contrast, when mode="hts", get_alpha returned a float. Since PyTorch has built-in compatibility for float types, this will not raise an error.

This PR ensures that "auto" mode consistently return a float, which avoids type errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.98%. Comparing base (053d888) to head (ebc861b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #105   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         220      220           
  Lines        6600     6603    +3     
=======================================
+ Hits         6599     6602    +3     
  Misses          1        1           

Flag	Coverage Δ
unittests	99.98% <100.00%> (+<0.01%)	⬆️

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[takenori-y]

Thanks for the modification!