[to #42322933] fix init issues for multi-style cartoon models

1. 修复多风格模型pipeline初始化问题
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10249429

modelscope/pipelines/cv/image_cartoon_pipeline.py

@@ -39,10 +39,13 @@ class ImageCartoonPipeline(Pipeline):
         super().__init__(model=model, **kwargs)
         with device_placement(self.framework, self.device_name):
             self.facer = FaceAna(self.model)
-            self.sess_anime_head = self.load_sess(
-                os.path.join(self.model, 'cartoon_h.pb'), 'model_anime_head')
-            self.sess_anime_bg = self.load_sess(
-                os.path.join(self.model, 'cartoon_bg.pb'), 'model_anime_bg')
+            with tf.Graph().as_default():
+                self.sess_anime_head = self.load_sess(
+                    os.path.join(self.model, 'cartoon_h.pb'),
+                    'model_anime_head')
+                self.sess_anime_bg = self.load_sess(
+                    os.path.join(self.model, 'cartoon_bg.pb'),
+                    'model_anime_bg')
 
         self.box_width = 288
         global_mask = cv2.imread(os.path.join(self.model, 'alpha.jpg'))