Fixed GPU device index for gpu and cpu modes

test_gpu

@@ -36,7 +36,7 @@ state_dim=7056
 ncols=1
 agent_params="lr="$lr",ep=1,ep_end="$eps_end",ep_endt="$eps_endt",discount="$discount",hist_len=4,learn_start="$learn_start",replay_memory="$replay_memory",update_freq="$update_freq",n_replay="$n_replay",network="$netfile",preproc="$preproc_net",state_dim="$state_dim",minibatch_size=32,rescale_r=1,ncols="$ncols",bufferSize=512,valid_size=500,target_q=10000,clip_delta=1,min_reward=-1,max_reward=1"
 gif_file="../gifs/$ENV.gif"
-gpu=1
+gpu=0
 random_starts=30
 pool_frms="type="$pool_frms_type",size="$pool_frms_size
 num_threads=4