set deploy python path (#1724)

deploy/python/infer.py

@@ -12,7 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os, sys
+# add python path of PadleDetection to sys.path
+parent_path = os.path.abspath(os.path.join(__file__, *(['..'] * 3)))
+if parent_path not in sys.path:
+    sys.path.append(parent_path)
+
 import argparse
 import time
 import yaml