updated comments, cleaned up nextClip and staySame process in get_videos, reflecting recent change from update_user_play().
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@ -1,6 +1,6 @@
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'''
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Recommendation Engine Example
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1 Nov 2017, 0x2620
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Recommendation Engine ver 1
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30 Nov 2018, 0x2620
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'''
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from collections import defaultdict
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@ -95,7 +95,11 @@ class Engine:
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def get_videos(self, user):
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# Update self_playlists first to reflect changes
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## Output is a dictionary of: user keyword scores, list of videos for each grid index (0-15),
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## and parameters to be displayed on debug view.
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## It implements "next clip" "next playlist" "stay same" grid allocation for the output video, depending on the user log history.
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# Update self_playlists to reflect user log history
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playlists = self.update_user_playlists(user)
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# Get the user keyword scores for debug view
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user_keywords = copy.deepcopy(user.get('keywords', {}))
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@ -104,6 +108,7 @@ class Engine:
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top_user_keywords = sorted([(k,v) for (k,v) in theme_tags.items()], key=lambda kv: kv[1])[-5:]
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top_user_characters = sorted([(k,v) for (k,v) in character_tags.items()], key=lambda kv: kv[1])[-5:]
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# If the most recent event is "login," initialize grid videos.
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if user.get('events', [{}])[0].get("event")=="login":
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return {
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'user': {
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@ -120,12 +125,12 @@ class Engine:
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sliders = {k: v.get('value', 0) for k, v in self.state['globalKeywords'].items()}
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grid_change = {k: v.get('value', 0) for k, v in self.state['gridChange'].items()}
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# check if there were grid events for all indexes.
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grid_events = {}
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(nc, np, ns) = (grid_change.get("nextClip"), grid_change.get("nextPlaylist"), grid_change.get("staySame"))
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video_num = nc + np + ns
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# # The version where the loop also extract play_index; requires "index" in play event data (previously unavailable):
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# collect the most recent grid event for each grid index and the grid index of the most recent play event.
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# the following requires "index" in play event data (previously unavailable)
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play_index = None
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for event in user.get('events', []):
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if event.get('event') == "grid" and event.get('data').get('index') not in grid_events:
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@ -155,7 +160,7 @@ class Engine:
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video_indx = list(range(video_num))
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random.shuffle(video_indx)
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else:
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# played index is excluded from the random shuffle and deterministically added to staySame pool.
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# play index is excluded from the random shuffle and deterministically added to staySame pool.
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video_indx = [*range(play_index)]+[*range(play_index+1,video_num)]
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random.shuffle(video_indx)
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video_indx.append(play_index)
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@ -166,58 +171,53 @@ class Engine:
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rec_list = []
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# Make sure the playlist exists for staySame pool; otherwise add it to nextPlaylist pool.
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for i in stay_same_index:
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if prev_grid_list[i].get("playlist") not in [playlist["name"] for playlist in playlists]:
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next_playlist_index.append(stay_same_index)
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# select next clip for nextClip pool except when the playlist has only one clip. It skips the clip with "pass":True when selecting the next clip.
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# nextClip pool: select next clip except when the playlist has only one clip. skip the clip with "pass":True when selecting the next clip.
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for i in next_clip_index:
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# add this to deal with the absence of "playlist" data in old grid event or the case where the playlist has been eliminated due to update_user_playlists().
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if prev_grid_list[i].get("playlist") not in [playlist["name"] for playlist in playlists]:
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# add this to deal with the absence of "playlist" data in old grid event or the case where the playlist has been eliminated.
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next_playlist_index.append(next_clip_index)
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break
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next_playlist_index.append(i)
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else:
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for playlist in playlists:
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if playlist.get('name')== prev_grid_list[i].get('playlist'):
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unwatched_clips_indx = [j for j in range(len(playlist["clips"])) if playlist["clips"][j].get("pass",False)!=True]
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unwatched_clips_indx = [j for j in range(len(playlist["clips"])) if not playlist["clips"][j].get("pass")]
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if len(playlist["clips"]) == 1:
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next_playlist_index.append(i)
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break
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# Discuss how this behavour should be: should it switch to a new playlist if it is the end of the playlist clip sequence already?
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elif prev_grid_list[i].get('playlistPosition', 0) + 1 == len(playlist['clips']):
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if unwatched_clips_indx[0] != prev_grid_list[i]['playlistPosition']:
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playlist_pos = unwatched_clips_indx[0]
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else:
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next_playlist_index.append(i)
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else:
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if len([j for j in unwatched_clips_indx if j > prev_grid_list[i]['playlistPosition']]) == 0:
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next_unwatched_indx = [j for j in unwatched_clips_indx if j > prev_grid_list[i]['playlistPosition']]
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if len(next_unwatched_indx) == 0:
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if unwatched_clips_indx[0] != prev_grid_list[i]['playlistPosition']:
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playlist_pos = unwatched_clips_indx[0]
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else:
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next_playlist_index.append(i)
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break
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else:
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playlist_pos = [j for j in unwatched_clips_indx if j > prev_grid_list[i]['playlistPosition']][0]
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playlist_pos = next_unwatched_indx[0]
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rec_list.append((i, {
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'clips': playlist['clips'],
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# 'position': random.randrange(len(playlist['clips'])),
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'position': playlist_pos,
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'name': playlist['name'],
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'tags': playlist['tags'],
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}))
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rec_list.append((i, {
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'clips': playlist['clips'],
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'position': playlist_pos,
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'name': playlist['name'],
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'tags': playlist['tags']
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}))
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# randomly select playlists (excluding the playlists from the current grid once "playlist" is recorded for grid events)
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# for nextPlaylist pool.
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#staySame pool
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for i in stay_same_index:
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# add this to deal with the absence of "playlist" data in old grid event or the case where the playlist has been eliminated due to update_user_playlists().
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if prev_grid_list[i].get("playlist") not in [playlist["name"] for playlist in playlists]:
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next_playlist_index.append(i)
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else:
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rec_list.append((i,{}))
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# nextPlaylist pool: randomly select playlists (excluding the playlists from the current grid).
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vids_exclude = [e.get("playlist") for e in prev_grid_list]
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while None in vids_exclude:
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vids_exclude.remove(None)
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video = self.get_recommendations(playlists, user, vids_exclude)
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rec_list += [(i, video[i]) for i in next_playlist_index]
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#staySame pool
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rec_list += [(i,{}) for i in stay_same_index]
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rec_list = sorted(rec_list, key=lambda k:k[0])
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videos_ = [e[1] for e in rec_list]
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@ -345,7 +345,6 @@ class Engine:
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# If the number of playlists is reduced to 30, reset it to the original.
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if len(playlists) < 30:
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playlists = copy.deepcopy(self.playlists)
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return(playlists)
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