Poisson Log loss

Compute the Area Under the Precision-Recall Curve (PR AUC) from prediction scores.

1 | ```
PRAUC(y_pred, y_true)
``` |

`y_pred` |
Predicted probabilities vector, as returned by a classifier |

`y_true` |
Ground truth (correct) 0-1 labels vector |

Area Under the PR Curve (PR AUC)

1 2 3 4 |

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