convert representation to distance

[todo]

Contrast-You/contrastyou/epocher/contrast_epocher.py

Lines 44 to 49 in 2086023

	# todo: convert representation to distance
	contrastive_loss = self._contrastive_criterion(img_repr, img_tf_repr, partition_list, group_list)
	self._model.zero_grad()
	contrastive_loss.backward()
	self._model.step()
	# todo: meter recording.

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This issue was generated by todo based on a todo comment in 2086023. It's been assigned to @jizongFox because they committed the code.