Use integer rates in pitch shift resample (#1861)

torchaudio/functional/functional.py

@@ -1690,7 +1690,7 @@ def pitch_shift(
 
     Args:
         waveform (Tensor): The input waveform of shape `(..., time)`.
-        sample_rate (float): Sample rate of `waveform`.
+        sample_rate (int): Sample rate of `waveform`.
         n_steps (int): The (fractional) steps to shift `waveform`.
         bins_per_octave (int, optional): The number of steps per octave (Default: ``12``).
         n_fft (int, optional): Size of FFT, creates ``n_fft // 2 + 1`` bins (Default: ``512``).
@@ -1736,7 +1736,7 @@ def pitch_shift(
                                    win_length=win_length,
                                    window=window,
                                    length=len_stretch)
-    waveform_shift = resample(waveform_stretch, sample_rate / rate, float(sample_rate))
+    waveform_shift = resample(waveform_stretch, sample_rate // rate, float(sample_rate))
     shift_len = waveform_shift.size()[-1]
     if shift_len > ori_len:
         waveform_shift = waveform_shift[..., :ori_len]