Allow for giving a single score for the whole object

Author: Agustín Castro

norfair/tracker.py

@@ -746,7 +746,7 @@ class Detection:
     Parameters
     ----------
     points : np.ndarray
-        Points detected. Must be a rank 2 array with shape `(n_points, n_dimensions)` where n_dimensions is 2 or 3.
+        Points detected. Must be a rank 2 array with shape `(n_points, n_dimensions)`.
     scores : np.ndarray, optional
         An array of length `n_points` which assigns a score to each of the points defined in `points`.
 
@@ -770,12 +770,19 @@ class Detection:
     def __init__(
         self,
         points: np.ndarray,
-        scores: np.ndarray = None,
+        scores: Union[float, int, np.ndarray] = None,
         data: Any = None,
         label: Hashable = None,
         embedding=None,
     ):
         self.points = validate_points(points)
+
+        if isinstance(scores, np.ndarray):
+            assert len(scores) == len(
+                self.points
+            ), "scores should be a np.ndarray with it's length being equal to the amount of points."
+        else:
+            scores = np.zeros((len(points),)) + scores
         self.scores = scores
         self.data = data
         self.label = label

norfair/utils.py

@@ -20,7 +20,7 @@ def validate_points(points: np.ndarray) -> np.array:
 
 def raise_detection_error_message(points):
     message = "\n[red]INPUT ERROR:[/red]\n"
-    message += f"Each `Detection` object should have a property `points` of shape (num_of_points_to_track, 2), not {points.shape}. Check your `Detection` list creation code.\n"
+    message += f"Each `Detection` object should have a property `points` of shape (n_points, n_dimensions), not {points.shape}. Check your `Detection` list creation code.\n"
     message += "You can read the documentation for the `Detection` class here:\n"
     message += "https://tryolabs.github.io/norfair/reference/tracker/#norfair.tracker.Detection\n"
     raise ValueError(message)