Images from different classes with similar appear- ance and images from the same class with different appear- ance are likely to form hard examples. Adding them to the same mini-batch should help the neural network to ignore some misleading appearance features. In the context of face recognition...
These would be contributions of fluvial materials deposited on the shoreline that would have been reworked by the waves and longshore drift to form sand bars that would create beach barriers that would temporarily block the outflow of the creeks into the sea. The attributed age corresponds with ...