fix register_fields bug in tuner and add dependencies

[chelseabright96]

Fixed register_fields bug in tuner:

• fixed error where registry was being transferred without existing source registry
  Added dependencies and fixed compatibility issue with scipy

[ArianAmani]

Can we have this section similar to the part above it?
Eventually, something like this I think:

Suggested change

	# getattr(experiment.model_cls, experiment.setup_method_name)(
	# experiment.data,
	# # **experiment.setup_method_args,
	# )
	experiment.model_cls.setup_anndata(experiment.data, **setup_anndata_kwargs)
	model = experiment.model_cls(experiment.data, **model_args)
	model.train(max_epochs=train_args.pop("max_epochs",2000),
	use_gpu=train_args.pop("use_gpu",True),
	early_stopping_patience=train_args.pop("early_stopping_patience",10),
	check_val_every_n_epoch=train_args.pop("check_val_every_n_epoch",5),
	plan_kwargs=plan_kwargs,
	**train_args)
	adata = experiment.data.copy()
	if sub_sample is not None:
	sc.pp.subsample(adata, fraction=sub_sample)
	experiment.model_cls.setup_anndata(adata, **setup_anndata_kwargs)
	model = experiment.model_cls(adata, **model_args)
	model.train(plan_kwargs=plan_kwargs, **train_args)
	del adata
	import gc
	gc.collect()