Merge pull request #18 from KushnirDmytro/optimize_memory_dist_add_symmetric

Memory optimized dists_add_symmetric

Author: nim65s

cosypose/lib3d/distances.py

@@ -8,14 +8,12 @@ def dists_add(TXO_pred, TXO_gt, points):
     dists = TXO_gt_points - TXO_pred_points
     return dists
 
-
 def dists_add_symmetric(TXO_pred, TXO_gt, points):
     TXO_pred_points = transform_pts(TXO_pred, points)
     TXO_gt_points = transform_pts(TXO_gt, points)
-    dists = TXO_gt_points.unsqueeze(1) - TXO_pred_points.unsqueeze(2)
-    dists_norm_squared = (dists ** 2).sum(dim=-1)
-    assign = dists_norm_squared.argmin(dim=1)
-    ids_row = torch.arange(dists.shape[0]).unsqueeze(1).repeat(1, dists.shape[1])
-    ids_col = torch.arange(dists.shape[1]).unsqueeze(0).repeat(dists.shape[0], 1)
-    dists = dists[ids_row, assign, ids_col]
-    return dists
+    distances = torch.cdist(TXO_gt_points, TXO_pred_points,
+                            p=2, compute_mode='donot_use_mm_for_euclid_dist')
+    closest_points_idx = torch.argmin(distances, dim=2).squeeze()
+    TXO_pred_closest_to_gt = torch.index_select(TXO_pred_points, 1, closest_points_idx)
+    min_translations = TXO_gt_points - TXO_pred_closest_to_gt
+    return min_translations