!15376 fixed not support ps float16

From: @anancds
Reviewed-by: @limingqi107,@cristoval
Signed-off-by: @cristoval

model_zoo/official/cv/resnet/train.py

@@ -207,12 +207,14 @@ if __name__ == '__main__':
     metrics = {"acc"}
     if args_opt.run_distribute:
         metrics = {'acc': DistAccuracy(batch_size=config.batch_size, device_num=args_opt.device_num)}
-    model = Model(net, loss_fn=loss, optimizer=opt, loss_scale_manager=loss_scale, metrics=metrics,
-                  amp_level="O2", keep_batchnorm_fp32=False, eval_network=dist_eval_network)
     if (args_opt.net != "resnet101" and args_opt.net != "resnet50") or \
         args_opt.parameter_server or target == "CPU":
         ## fp32 training
         model = Model(net, loss_fn=loss, optimizer=opt, metrics=metrics, eval_network=dist_eval_network)
+    else:
+        model = Model(net, loss_fn=loss, optimizer=opt, loss_scale_manager=loss_scale, metrics=metrics,
+                      amp_level="O2", keep_batchnorm_fp32=False, eval_network=dist_eval_network)
+
     if cfg.optimizer == "Thor" and args_opt.dataset == "imagenet2012":
         from src.lr_generator import get_thor_damping
         damping = get_thor_damping(0, config.damping_init, config.damping_decay, 70, step_size)