diff --git a/.gitmodules b/.gitmodules
index 7a9c595..d61f3e0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -64,3 +64,6 @@
 [submodule "third_party/mast3r"]
 	path = third_party/mast3r
 	url = https://github.com/naver/mast3r
+[submodule "third_party/pram"]
+	path = third_party/pram
+	url = https://github.com/agipro/pram.git
diff --git a/hloc/extractors/sfd2.py b/hloc/extractors/sfd2.py
index 9fb76ed..2a8a004 100644
--- a/hloc/extractors/sfd2.py
+++ b/hloc/extractors/sfd2.py
@@ -1,4 +1,3 @@
-# -*- coding: UTF-8 -*-
 import sys
 from pathlib import Path
 
@@ -7,11 +6,9 @@
 from .. import logger
 from ..utils.base_model import BaseModel
 
-pram_path = Path(__file__).parent / "../../third_party/pram"
-sys.path.append(str(pram_path))
-
-from nets.sfd2 import load_sfd2
-
+tp_path = Path(__file__).parent / "../../third_party"
+sys.path.append(str(tp_path))
+from pram.nets.sfd2 import load_sfd2
 
 class SFD2(BaseModel):
     default_conf = {
@@ -26,7 +23,7 @@ def _init(self, conf):
         self.norm_rgb = tvf.Normalize(
             mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]
         )
-        model_fn = pram_path / "weights" / self.conf["model_name"]
+        model_fn = tp_path / "pram" / "weights" / self.conf["model_name"]
         self.net = load_sfd2(weight_path=model_fn).eval()
 
         logger.info("Load SFD2 model done.")
diff --git a/hloc/matchers/imp.py b/hloc/matchers/imp.py
index ca64980..05c3cb9 100644
--- a/hloc/matchers/imp.py
+++ b/hloc/matchers/imp.py
@@ -1,4 +1,3 @@
-# -*- coding: UTF-8 -*-
 import sys
 from pathlib import Path
 
@@ -7,10 +6,9 @@
 from .. import DEVICE, logger
 from ..utils.base_model import BaseModel
 
-pram_path = Path(__file__).parent / "../../third_party/pram"
-sys.path.append(str(pram_path))
-
-from nets.gml import GML
+tp_path = Path(__file__).parent / "../../third_party"
+sys.path.append(str(tp_path))
+from pram.nets.gml import GML
 
 
 class IMP(BaseModel):
@@ -33,7 +31,8 @@ class IMP(BaseModel):
 
     def _init(self, conf):
         self.conf = {**self.default_conf, **conf}
-        weight_path = pram_path / "weights" / self.conf["model_name"]
+        weight_path = tp_path / "pram" / "weights" / self.conf["model_name"]
+        # self.net = nets.gml(self.conf).eval().to(DEVICE)
         self.net = GML(self.conf).eval().to(DEVICE)
         self.net.load_state_dict(
             torch.load(weight_path, map_location="cpu")["model"], strict=True
diff --git a/third_party/pram b/third_party/pram
new file mode 160000
index 0000000..742ff42
--- /dev/null
+++ b/third_party/pram
@@ -0,0 +1 @@
+Subproject commit 742ff4241105bfaee0039e01556c79fb9be5c8b8