Fix target_train_data_fraction overriding pretrain_data_fraction #1070
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…-mll#1070) * add private instance generator field to Task w/ getter and setter * update build_tasks to use new instance generator Task field setter * update trainer to get phase-appropriate instance generators * update evaluate to use new Task instance generator getter * update pred writing task to use new instance generator getter/setter * add tests for new Task instance generator functionality
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This PR addresses the bug described in issue #1066 ("Results with pretrain_data_fraction args").
This PR...
Taskobject (_instance_generators) to store instance generators with the appropriate phase-specific data fraction settings.get_instance_generatorand setterset_instance_generator, toTaskto access the_instance_generators.Task's that an exception is raised when training instance generator is requested without specifying the phase (because phase determines data fraction).Validation: the config provided in issue #1066 was run with these code changes. Results logged for the task (MNLI) using a pretraining data fraction were more in line with expectation: after 25k steps training accuracy was ~100%, while val and test accuracy were ~75%.