Multiple Instance Learning is a type of weakly supervised learning algorithm where training data is arranged in bags, where each bag contains a set of instances , and there is one single label per bag, in the case of a binary classification problem. It is assumed that individual labels exist for the instances within a bag, but they are unknown during training. In the standard Multiple Instance assumption, a bag is considered negative if all its instances are negative. On the other hand, a bag is positive, if at least one instance in the bag is positive.
<span class="description-source">Source: Monte-Carlo Sampling applied to Multiple Instance Learning for Histological Image Classification </span>