@fchollet if I've trained 2+ identical Keras models on different training datasets, is there a simple way of merging the trained weights/gradients into one master model?
You can average either the gradients (during training), the weights (at the end -- see Polyak averaging for instance) or the final predictions (at inference time)
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This assumes equivalent models (datasets drawn from same distribution). For fundamentally different models, only do inference time prediction averaging (possibly a weighted average)
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I.e. only try to average weights or gradients if you have guarantees that every filter in every layer encodes the same thing across the models, which is the case if the models are offshoots of one another (e.g. Polyak averaging) or start with a reproducible seed training phase
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