Fix py3 in cyclegan and save image (#2499)

* fix py3

PaddleCV/gan/trainer/CycleGAN.py

@@ -96,11 +96,11 @@ class GTrainer():
                     learning_rate=fluid.layers.piecewise_decay(
                         boundaries=[99 * step_per_epoch] + [
                             x * step_per_epoch
-                            for x in xrange(100, cfg.epoch - 1)
+                            for x in range(100, cfg.epoch - 1)
                         ],
                         values=[lr] + [
                             lr * (1.0 - (x - 99.0) / 101.0)
-                            for x in xrange(100, cfg.epoch)
+                            for x in range(100, cfg.epoch)
                         ]),
                     beta1=0.5,
                     beta2=0.999,
@@ -136,11 +136,11 @@ class DATrainer():
                     learning_rate=fluid.layers.piecewise_decay(
                         boundaries=[99 * step_per_epoch] + [
                             x * step_per_epoch
-                            for x in xrange(100, cfg.epoch - 1)
+                            for x in range(100, cfg.epoch - 1)
                         ],
                         values=[lr] + [
                             lr * (1.0 - (x - 99.0) / 101.0)
-                            for x in xrange(100, cfg.epoch)
+                            for x in range(100, cfg.epoch)
                         ]),
                     beta1=0.5,
                     beta2=0.999,
@@ -175,11 +175,11 @@ class DBTrainer():
                     learning_rate=fluid.layers.piecewise_decay(
                         boundaries=[99 * step_per_epoch] + [
                             x * step_per_epoch
-                            for x in xrange(100, cfg.epoch - 1)
+                            for x in range(100, cfg.epoch - 1)
                         ],
                         values=[lr] + [
                             lr * (1.0 - (x - 99.0) / 101.0)
-                            for x in xrange(100, cfg.epoch)
+                            for x in range(100, cfg.epoch)
                         ]),
                     beta1=0.5,
                     beta2=0.999,

PaddleCV/gan/util/utility.py

@@ -149,7 +149,8 @@ def save_test_image(epoch,
                 for j in range(len(label_org)):
                     label_trg_tmp[j][i] = 1.0 - label_trg_tmp[j][i]
 
-                label_trg_ = map(lambda x: ((x * 2) - 1) * 0.5, label_trg_tmp)
+                label_trg_ = list(
+                    map(lambda x: ((x * 2) - 1) * 0.5, label_trg_tmp))
 
                 for j in range(len(label_org)):
                     label_trg_[j][i] = label_trg_[j][i] * 2.0