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Transfer learning
Using pre-trained models / their trained weights as a starting point to train a model for a different data set.
Prereqs: - Pre-trained model needs to generalize
Image-based NNs
Pre-trained models which generalize can be used as a starting model, e.g. https://github.com/KaimingHe/deep-residual-networks ResNet models.
For CNNs more generic features are usually contained in the earlier layers.