actlearn: models: SDA: Fix Parameter Export Bug
actlearn: models: SDA: Fix Parameter Export Bug

1. Previously due to symbolic linking, the parameter exported to dict
is the sybolic variable instead of the value of the variables at the
time of export. Now, when export_to_dict function is called, current
value of each parameter is saved in the dictionary.

2. Return cost function result in fine_tuning function

Signed-off-by: Tinghui Wang <b242afeef4efadf7acab60ba9204ad943623eea5@wsu.edu>

TinghuiWang/ActivityLearning