scikit-hep / iminuit / 33514294405

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fix: UnbinnedNLL.scaled_pdf scale for multivariate data (#1146)

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Split out of #1137.

`scaled_pdf` must scale by the number of data points. For multivariate
data of shape `(D, N)`, `np.prod(data.shape)` gives `D * N`, so the
number density was too large by the factor `D`. `data.shape[-1]` is
correct for 1D and multivariate data.

Reported in #1132.

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