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Representative dataset used to optimize the model.
tf.lite.RepresentativeDataset( input_gen )
This is a generator function that provides a small dataset to calibrate or estimate the range, i.e, (min, max) of all floating-point arrays in the model (such as model input, activation outputs of intermediate layers, and model output) for quantization. Usually, this is a small subset of a few hundred samples randomly chosen, in no particular order, from the training or evaluation dataset.