add progress bar display

ppgan/metric/compute_fid.py

@@ -23,8 +23,10 @@ import paddle.fluid as fluid
 from inception import InceptionV3
 from paddle.fluid.dygraph.base import to_variable
 
-
-def tqdm(x):
+try:
+    from tqdm import tqdm
+except:
+    def tqdm(x):
         return x