[Predator] Generate all changelogs in regression ranges instead of only matched changelogs

appengine/findit/crash/scorers/top_frame_index.py

-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""TopFrameIndex scorer applies to all Result objects.
-
-It represents a heuristic rule:
-  The less the top frame index (this result changed) is, the higher score.
-"""
-
-from crash.scorers.scorer import Scorer
-
-# TODO(katesonia): Move this to the config saved in datastore.
-_MAX_TOP_N_FRAMES = 7
-_INFINITY = 1000
-
-
-class TopFrameIndex(Scorer):
-
-  def __init__(self, max_top_n=_MAX_TOP_N_FRAMES):
-    self.max_top_n = max_top_n
-
-  def GetMetric(self, result):
-    if not result.file_to_stack_infos:
-      return None
-
-    top_frame_index = _INFINITY
-    for _, stack_infos in result.file_to_stack_infos.iteritems():
-      for frame, _ in stack_infos:
-        top_frame_index = min(top_frame_index, frame.index)
-
-    return top_frame_index
-
-  def Score(self, top_frame_index):
-    # TODO(katesonia): experiment the model and parameters later.
-    if top_frame_index < self.max_top_n:
-      return 1 - top_frame_index / float(self.max_top_n)
-
-    return 0
-
-  def Reason(self, top_frame_index, score):
-    if score == 0:
-      return None
-
-    return self.name, score, 'Top frame is #%d' % top_frame_index
-
-  def ChangedFiles(self, result, score):
-    # There is no changed file infos that top frame scorer can provide.
-    return None