add schema info

Signed-off-by: junjie.jiang <junjie.jiang@zilliz.com>

timm_image.py

@@ -22,6 +22,7 @@ import towhee
 from towhee.operator.base import NNOperator, OperatorFlag
 from towhee.types.arg import arg, to_image_color
 from towhee import register
+from towhee.types import Image
 
 import torch
 from torch import nn
@@ -144,3 +145,12 @@ class TimmImage(NNOperator):
         else:
             log.error(f'Invalid format "{format}". Currently supported formats: "pytorch".')
         return model_list
+
+    def input_schema(self):
+        return [(Image, (-1, -1, 3))]
+
+    def output_schema(self):
+        image = Image(numpy.random.randn(480, 480, 3), "RGB")
+        ret = self(image)
+        data_type = type(ret.reshape(-1)[0])
+        return [(data_type, ret.shape)]