Raise invalid spread threshold for direction estimate radius optimizer

Author: francois-drielsma

spine/utils/gnn/cluster.py

@@ -1016,7 +1016,7 @@ def cluster_direction(voxels: nb.float64[:,:],
             # Get the eigenvalues, compute relative transverse spread
             w, _ = np.linalg.eigh(covk)
             labels[i] = np.sqrt(w[2] / (w[0] + w[1])) \
-                    if (w[0] + w[1]) / w[2] > 1e-9 else 0.
+                    if (w[0] + w[1]) / w[2] > 1e-6 else 0.
 
             # If the value is the same as the previous, choose this one
             if dist_mat[i] == dist_mat[i-1]: