message: Revised formula in docstring
diff: @@ -770,8 +770,7 @@ class CategoricalAccuracy(MeanMetricWrapper):
  class SparseCategoricalAccuracy(MeanMetricWrapper):
  """Calculates how often predictions matches integer labels.
  - `acc = dot(sample_weight, (y_true == argmax(y_pred)) / n_pred`
  - where `n_pred = len(y_true)`
  + `acc = np.dot(sample_weight, np.equal(y_true, np.argmax(y_pred, axis=1))`
  You can provide logits of classes as `y_pred`, since argmax of
  logits and probabilities are same.
  