fix(learner): LearnerTorchModel now works in parallel settings
#350
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Because `LearnerTorchModel` stored an instantiated `nn_module`, this caused issues when transferring the learner to the worker, e.g. when using callr encapsulation. This is now solved by serializing the network and unserializing it during training.
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Because
LearnerTorchModelstored an instantiatednn_module, this caused issues when transferring the learner to the worker, e.g. when using callr encapsulation.This is now solved by serializing the network and unserializing it during training.