baseline problem in the vanilla policy gradient example

[flyers]

Hi everyone,
When I am running the rllab/examples/vpg_2.py example, I found that the baseline is actually a zero vector. It seems that we need to explicitly call the baseline.fit method before calling the baseline.predict method. @dementrock
Thanks.

[dementrock]

Ahh yes. Your interpretation is correct & thanks for reporting the issue! I will push a fix to the master branch shortly.