Allow TiedLayerSpec to have multiple tied weights #4216
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Follow-up from (and directly reusing code from): #2035
This PR allows
TiedLayerSpec
to support a list of tied weights. This will allow whole layers to be reused.Re: #2035 (comment),
tied_weight_attrss
has two Ss intentionally, as it is a dictionary of lists. (Happy to rename to something else too.)Credit: @thomasw21