Extract finding directories for test data

Summary: Make common functions for finding directories where test data is found, instead of lots of tests using their own `__file__`  while trying to get ./tests/data and the tutorials data.

Reviewed By: nikhilaravi

Differential Revision: D27633701

fbshipit-source-id: 1467bb6018cea16eba3cab097d713116d51071e9

tests/test_points_alignment.py

@@ -1,11 +1,10 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 import unittest
-from pathlib import Path
 
 import numpy as np
 import torch
-from common_testing import TestCaseMixin
+from common_testing import TestCaseMixin, get_tests_dir
 from pytorch3d.ops import points_alignment
 from pytorch3d.structures.pointclouds import Pointclouds
 from pytorch3d.transforms import rotation_conversions
@@ -40,7 +39,7 @@ class TestICP(TestCaseMixin, unittest.TestCase):
         super().setUp()
         torch.manual_seed(42)
         np.random.seed(42)
-        trimesh_results_path = Path(__file__).resolve().parent / "data/icp_data.pth"
+        trimesh_results_path = get_tests_dir() / "data/icp_data.pth"
         self.trimesh_results = torch.load(trimesh_results_path)
 
     @staticmethod