fix spade (#3964)

PaddleCV/PaddleGAN/data_reader.py

@@ -308,7 +308,7 @@ class triplex_reader_creator(reader_creator):
                 input_label = np.zeros(
                     (args.label_nc, index.shape[1], index.shape[2]))
                 np.put_along_axis(input_label, index, 1.0, 0)
-                img1 = input_label
+                img1 = input_label.astype('float32')
                 img2 = (np.array(img2).astype('float32') / 255.0 - 0.5) / 0.5
                 img2 = img2.transpose([2, 0, 1])
                 if not args.no_instance: