[Beta] Complex Numbers
The PyTorch 1.6 release brings beta level support for complex tensors including torch.complex64 and torch.complex128 dtypes. A complex number is a number that can be expressed in the form a + bj, where a and b are real numbers, and j is a solution of the equation x^2 = −1. Complex numbers frequently occur in mathematics and engineering, especially in signal processing and the area of complex neural networks is an active area of research. The beta release of complex tensors will support common PyTorch and complex tensor functionality, plus functions needed by Torchaudio, ESPnet and others. While this is an early version of this feature, and we expect it to improve over time, the overall goal is provide a NumPy compatible user experience that leverages PyTorch’s ability to run on accelerators and work with autograd to better support the scientific community. 
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