i downloaded model from facebook / blenderbot_small-90M , and loaded it with BlenderbotSmallTokenizer.from_pretrained() and BlenderbotSmallForConditionalGeneration.from_pretrained() respectively. When i looked into trainable_variables using:
for v in model.trainable_variables():
	print(v)

i found they were equal, but doc says there is a a language modeling head in TFBlenderbotSmallForConditionalGeneration, how can i get the weights of the head?