DOC Fixes confusing notation for y and y_pred (#23193)

thomasjpfan · web-flow · commit 3082d9570431 · 2022-04-23T11:15:47.000+02:00
diff --git a/doc/modules/model_evaluation.rst b/doc/modules/model_evaluation.rst
@@ -930,18 +930,18 @@ produce an F-score that is not between precision and recall.
 
 To make this more explicit, consider the following notation:
 
-* :math:`y` the set of *predicted* :math:`(sample, label)` pairs
-* :math:`\hat{y}` the set of *true* :math:`(sample, label)` pairs
+* :math:`y` the set of *true* :math:`(sample, label)` pairs
+* :math:`\hat{y}` the set of *predicted* :math:`(sample, label)` pairs
 * :math:`L` the set of labels
 * :math:`S` the set of samples
 * :math:`y_s` the subset of :math:`y` with sample :math:`s`,
   i.e. :math:`y_s := \left\{(s', l) \in y | s' = s\right\}`
 * :math:`y_l` the subset of :math:`y` with label :math:`l`
 * similarly, :math:`\hat{y}_s` and :math:`\hat{y}_l` are subsets of
   :math:`\hat{y}`
-* :math:`P(A, B) := \frac{\left| A \cap B \right|}{\left|A\right|}` for some
+* :math:`P(A, B) := \frac{\left| A \cap B \right|}{\left|\right|}` for some
   sets :math:`A` and :math:`B`
-* :math:`R(A, B) := \frac{\left| A \cap B \right|}{\left|B\right|}`
+* :math:`R(A, B) := \frac{\left| A \cap B \right|}{\left|A\right|}`
   (Conventions vary on handling :math:`B = \emptyset`; this implementation uses
   :math:`R(A, B):=0`, and similar for :math:`P`.)
 * :math:`F_\beta(A, B) := \left(1 + \beta^2\right) \frac{P(A, B) \times R(A, B)}{\beta^2 P(A, B) + R(A, B)}`
