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Allow varying number of student model heads during distillation #3447
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stephenroller
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Feb 10, 2021
klshuster
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Feb 10, 2021
stephenroller
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Feb 11, 2021
* Allow number of attention heads to vary * Put checks behind shared
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Patch description
When doing knowledge distillation, allow for the number of attention heads in the student model to differ from that in the teacher model, provided that:
(1) We are doing TinyBERT-style distillation, in which the weights of the teacher model are not copied to the student
(2) The coefficients on the loss terms of the MSE of the attention matrices between the two models are both exactly 0, meaning that we do not have to minimize the differences between them, which would be impossible with a different number of attention heads in each model
Testing steps
Existing distillation CI checks