change uses of 'Learner.tell' to 'Learner._tell' where appropriate

All occurances of 'add_point' before commit 58a30fe1 should be
'_tell' now, and 'add_data' should be 'tell'.

Fixes #58.

adaptive/learner/balancing_learner.py

@@ -62,7 +62,7 @@ class BalancingLearner(BaseLearner):
                 pairs.append((index, point[0]))
             x, _ = max(zip(pairs, loss_improvements), key=itemgetter(1))
             points.append(x)
-            self.tell(x, None)
+            self._tell(x, None)
 
         return points, None
 
@@ -78,7 +78,7 @@ class BalancingLearner(BaseLearner):
         index, x = x
         self._points.pop(index, None)
         self._loss.pop(index, None)
-        self.learners[index].tell(x, y)
+        self.learners[index]._tell(x, y)
 
     def loss(self, real=True):
         losses = []

adaptive/learner/data_saver.py

@@ -40,4 +40,4 @@ class DataSaver:
     def _tell(self, x, result):
         y = self.arg_picker(result) if result is not None else None
         self.extra_data[x] = result
-        self.learner.tell(x, y)
+        self.learner._tell(x, y)

adaptive/learner/integrator_learner.py

@@ -408,7 +408,7 @@ class IntegratorLearner(BaseLearner):
             # Update the mappings
             self.x_mapping[x].add(ival)
             if x in self.done_points:
-                self.tell(x, self.done_points[x])
+                self._tell(x, self.done_points[x])
             elif x not in self.pending_points:
                 self.pending_points.add(x)
                 self._stack.append(x)

adaptive/runner.py

@@ -186,7 +186,7 @@ class BlockingRunner(BaseRunner):
                         ) from e
                     if do_log:
                         self.log.append(('tell', x, y))
-                    self.learner.tell(x, y)
+                    self.learner._tell(x, y)
 
         finally:
             # remove points with 'None' values from the learner
@@ -390,7 +390,7 @@ class AsyncRunner(BaseRunner):
                         ) from e
                     if do_log:
                         self.log.append(('tell', x, y))
-                    self.learner.tell(x, y)
+                    self.learner._tell(x, y)
         finally:
             # remove points with 'None' values from the learner
             self.learner.remove_unfinished()
@@ -432,7 +432,7 @@ def simple(learner, goal):
         xs, _ = learner.ask(1)
         for x in xs:
             y = learner.function(x)
-            learner.tell(x, y)
+            learner._tell(x, y)
 
 
 def replay_log(learner, log):