chore: remove torch in main code (#439)

* use np.ndarray in costeer model evaluators

* remove package

* fix test error

---------

Co-authored-by: Xu Yang <peteryang@vip.qq.com>

test/utils/test_import.py

@@ -21,6 +21,8 @@ class TestRDAgentImports(unittest.TestCase):
                 continue
             if "_template" in fstr:
                 continue
+            if "model_coder" in fstr:
+                continue
             if (
                 fstr.endswith("rdagent/log/ui/app.py")
                 or fstr.endswith("rdagent/app/cli.py")