'Wishart probability density function.
Parameters
x : array_like
Quantiles, with the last axis of `x` denoting the components.
Each quantile must be a symmetric positive definite matrix.
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Returns
pdf : ndarray
Probability density function evaluated at `x`
Notes
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def pdf(self, x, df, scale):

    return np.exp(self.logpdf(x, df, scale))
