U d@s,ddlmZddlmZGdddeZdS)) constraints)GammacsFeZdZdZdejiZd fdd Zd fdd Ze dd Z Z S) Chi2ay Creates a Chi-squared distribution parameterized by shape parameter :attr:`df`. This is exactly equivalent to ``Gamma(alpha=0.5*df, beta=0.5)`` Example:: >>> m = Chi2(torch.tensor([1.0])) >>> m.sample() # Chi2 distributed with shape df=1 tensor([ 0.1046]) Args: df (float or Tensor): shape parameter of the distribution dfNcstt|jd|d|ddS)Ng?) validate_args)superr__init__)selfrr __class__s