Shortcuts, *, sym=True, dtype=None, layout=torch.strided, device=None, requires_grad=False)[source]

Computes a window with a simple cosine waveform. Also known as the sine window.

The cosine window is defined as follows:

wn=cos(πnMπ2)=sin(πnM)w_n = \cos{\left(\frac{\pi n}{M} - \frac{\pi}{2}\right)} = \sin{\left(\frac{\pi n}{M}\right)}

The window is normalized to 1 (maximum value is 1). However, the 1 doesn’t appear if M is even and sym is True.


M (int) – the length of the window. In other words, the number of points of the returned window.

Keyword Arguments
  • sym (bool, optional) – If False, returns a periodic window suitable for use in spectral analysis. If True, returns a symmetric window suitable for use in filter design. Default: True.

  • dtype (torch.dtype, optional) – the desired data type of returned tensor. Default: if None, uses a global default (see torch.set_default_dtype()).

  • layout (torch.layout, optional) – the desired layout of returned Tensor. Default: torch.strided.

  • device (torch.device, optional) – the desired device of returned tensor. Default: if None, uses the current device for the default tensor type (see torch.set_default_device()). device will be the CPU for CPU tensor types and the current CUDA device for CUDA tensor types.

  • requires_grad (bool, optional) – If autograd should record operations on the returned tensor. Default: False.

Return type



>>> # Generates a symmetric cosine window.
tensor([0.1564, 0.4540, 0.7071, 0.8910, 0.9877, 0.9877, 0.8910, 0.7071, 0.4540, 0.1564])

>>> # Generates a periodic cosine window.
>>>, sym=False)
tensor([0.1423, 0.4154, 0.6549, 0.8413, 0.9595, 1.0000, 0.9595, 0.8413, 0.6549, 0.4154])


Access comprehensive developer documentation for PyTorch

View Docs


Get in-depth tutorials for beginners and advanced developers

View Tutorials


Find development resources and get your questions answered

View Resources