fix typo

Author: Markus Dumke

lib/plotting.py

@@ -64,8 +64,8 @@ def plot_episode_stats(stats, smoothing_window=10, noshow=False):
     # Plot the episode length over time
     fig1 = plt.figure(figsize=(10,5))
     plt.plot(stats.episode_lengths)
-    plt.xlabel("Epsiode")
-    plt.ylabel("Epsiode Length")
+    plt.xlabel("Episode")
+    plt.ylabel("Episode Length")
     plt.title("Episode Length over Time")
     if noshow:
         plt.close(fig1)
@@ -76,8 +76,8 @@ def plot_episode_stats(stats, smoothing_window=10, noshow=False):
     fig2 = plt.figure(figsize=(10,5))
     rewards_smoothed = pd.Series(stats.episode_rewards).rolling(smoothing_window, min_periods=smoothing_window).mean()
     plt.plot(rewards_smoothed)
-    plt.xlabel("Epsiode")
-    plt.ylabel("Epsiode Reward (Smoothed)")
+    plt.xlabel("Episode")
+    plt.ylabel("Episode Reward (Smoothed)")
     plt.title("Episode Reward over Time (Smoothed over window size {})".format(smoothing_window))
     if noshow:
         plt.close(fig2)
@@ -95,4 +95,4 @@ def plot_episode_stats(stats, smoothing_window=10, noshow=False):
     else:
         plt.show(fig3)
 
-    return fig1, fig2, fig3
+    return fig1, fig2, fig3