Moving ray bundle to float dtype

Summary: We can now move ray bundle to float dtype (e.g. from fp16 like types).

Reviewed By: bottler

Differential Revision: D57493109

fbshipit-source-id: 4e18a427e968b646fe5feafbff653811cd007981

Author: shapovalov

pytorch3d/implicitron/models/renderer/base.py

@@ -121,6 +121,19 @@ def lengths(self, value):
         else:
             self._lengths = value
 
+    def float_(self) -> None:
+        """Moves the tensors to float dtype in place
+        (helpful for mixed-precision tensors).
+        """
+        self.origins = self.origins.float()
+        self.directions = self.directions.float()
+        self._lengths = self._lengths.float() if self._lengths is not None else None
+        self.xys = self.xys.float()
+        self.bins = self.bins.float() if self.bins is not None else None
+        self.pixel_radii_2d = (
+            self.pixel_radii_2d.float() if self.pixel_radii_2d is not None else None
+        )
+
     def is_packed(self) -> bool:
         """
         Returns whether the ImplicitronRayBundle carries data in packed state