haoyifan modify figure1

AAAI2021/tex/introduction.tex

@@ -39,7 +39,7 @@ vocabulary can express almost infinite concepts.}
 %
 \begin{figure}[t]
   \centering
-  \includegraphics[width=0.99\columnwidth]{fig/Figure1-motivation.pdf}
+  \includegraphics[width=0.99\columnwidth]{fig/Figure1_motivation.pdf}
   \caption{The distribution of compositionality when training for 100 symbolic
     languages without
     any induction. It can be observed that high compositional symbolic language