Wrong Identification of Multi-Class Classification in Metrics Calculation

[fabiankueppers]

Setup:

• Using metrics package for classification (e.g., netcal.metrics.ECE)
• Binary classification (number of distinct ground-truth labels: 2)
• Input array with shape (n, 2) with n samples and confidence scores for the negative/positive classes, respectively

In this scenario, the metric erroneously identifies the input as mulit-class, although the input is binary. This results in an error.