silence ppdet import warning

paddlex/ppdet/__init__.py

@@ -14,12 +14,3 @@
 
 from . import (core, data, engine, modeling, model_zoo, optimizer, metrics,
                utils, slim)
-
-try:
-    from .version import full_version as __version__
-    from .version import commit as __git_commit__
-except ImportError:
-    import sys
-    sys.stderr.write("Warning: import paddlex.ppdet from source directory " \
-            "without installing, run 'python setup.py install' to " \
-            "install ppdet firstly\n")