Evaluate the probability density function.
Parameters: | data_predict: array_like, optional :
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Returns: | pdf_est: array_like :
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Notes
The probability density is given by the generalized product kernel estimator:
K_{h}(X_{i},X_{j}) = \prod_{s=1}^{q}h_{s}^{-1}k\left(\frac{X_{is}-X_{js}}{h_{s}}\right)