REK-proj-2/project_2_recommender_and_evaluation.ipynb

%matplotlib inline
%load_ext autoreload
%autoreload 2

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from IPython.display import Markdown, display, HTML
from collections import defaultdict

import torch
import torch.nn as nn
import torch.optim as optim
from livelossplot import PlotLosses

# Fix the dying kernel problem (only a problem in some installations - you can remove it, if it works without it)
import os
os.environ['KMP_DUPLICATE_LIB_OK'] = 'True'

The autoreload extension is already loaded. To reload it, use:
  %reload_ext autoreload

Load the dataset for recommenders

data_path = os.path.join("data", "hotel_data")

interactions_df = pd.read_csv(os.path.join(data_path, "hotel_data_interactions_df.csv"), index_col=0)

base_item_features = ['term', 'length_of_stay_bucket', 'rate_plan', 'room_segment', 'n_people_bucket', 'weekend_stay']

column_values_dict = {
    'term': ['WinterVacation', 'Easter', 'OffSeason', 'HighSeason', 'LowSeason', 'MayLongWeekend', 'NewYear', 'Christmas'],
    'length_of_stay_bucket': ['[0-1]', '[2-3]', '[4-7]', '[8-inf]'],
    'rate_plan': ['Standard', 'Nonref'],
    'room_segment': ['[0-160]', '[160-260]', '[260-360]', '[360-500]', '[500-900]'],
    'n_people_bucket': ['[1-1]', '[2-2]', '[3-4]', '[5-inf]'],
    'weekend_stay': ['True', 'False']
}

interactions_df.loc[:, 'term'] = pd.Categorical(
    interactions_df['term'], categories=column_values_dict['term'])
interactions_df.loc[:, 'length_of_stay_bucket'] = pd.Categorical(
    interactions_df['length_of_stay_bucket'], categories=column_values_dict['length_of_stay_bucket'])
interactions_df.loc[:, 'rate_plan'] = pd.Categorical(
    interactions_df['rate_plan'], categories=column_values_dict['rate_plan'])
interactions_df.loc[:, 'room_segment'] = pd.Categorical(
    interactions_df['room_segment'], categories=column_values_dict['room_segment'])
interactions_df.loc[:, 'n_people_bucket'] = pd.Categorical(
    interactions_df['n_people_bucket'], categories=column_values_dict['n_people_bucket'])
interactions_df.loc[:, 'weekend_stay'] = interactions_df['weekend_stay'].astype('str')
interactions_df.loc[:, 'weekend_stay'] = pd.Categorical(
    interactions_df['weekend_stay'], categories=column_values_dict['weekend_stay'])

display(HTML(interactions_df.head(15).to_html()))

	user_id	item_id	term	length_of_stay_bucket	rate_plan	room_segment	n_people_bucket	weekend_stay
0	1	0	WinterVacation	[2-3]	Standard	[260-360]	[5-inf]	True
1	2	1	WinterVacation	[2-3]	Standard	[160-260]	[3-4]	True
2	3	2	WinterVacation	[2-3]	Standard	[160-260]	[2-2]	False
3	4	3	WinterVacation	[4-7]	Standard	[160-260]	[3-4]	True
4	5	4	WinterVacation	[4-7]	Standard	[0-160]	[2-2]	True
5	6	5	Easter	[4-7]	Standard	[260-360]	[5-inf]	True
6	7	6	OffSeason	[2-3]	Standard	[260-360]	[5-inf]	True
7	8	7	HighSeason	[2-3]	Standard	[160-260]	[1-1]	True
8	9	8	HighSeason	[2-3]	Standard	[0-160]	[1-1]	True
9	8	7	HighSeason	[2-3]	Standard	[160-260]	[1-1]	True
10	8	7	HighSeason	[2-3]	Standard	[160-260]	[1-1]	True
11	10	9	HighSeason	[2-3]	Standard	[160-260]	[3-4]	True
12	11	9	HighSeason	[2-3]	Standard	[160-260]	[3-4]	True
13	12	10	HighSeason	[8-inf]	Standard	[160-260]	[3-4]	True
14	14	11	HighSeason	[2-3]	Standard	[0-160]	[3-4]	True

(Optional) Prepare numerical user features

The method below is left here for convenience if you want to experiment with content-based user features as an input for your neural network.

def n_to_p(l):
    n = sum(l)
    return [x / n for x in l] if n > 0 else l

def calculate_p(x, values):
    counts = [0]*len(values)
    for v in x:
        counts[values.index(v)] += 1

    return n_to_p(counts)

def prepare_users_df(interactions_df):

    users_df = interactions_df.loc[:, ["user_id"]]
    users_df = users_df.groupby("user_id").first().reset_index(drop=False)
    
    user_features = []

    for column in base_item_features:

        column_values = column_values_dict[column]
        df = interactions_df.loc[:, ['user_id', column]]
        df = df.groupby('user_id').aggregate(lambda x: list(x)).reset_index(drop=False)

        def calc_p(x):
            return calculate_p(x, column_values)

        df.loc[:, column] = df[column].apply(lambda x: calc_p(x))

        p_columns = []
        for i in range(len(column_values)):
            p_columns.append("user_" + column + "_" + column_values[i])
            df.loc[:, p_columns[i]] = df[column].apply(lambda x: x[i])
            user_features.append(p_columns[i])

        users_df = pd.merge(users_df, df.loc[:, ['user_id'] + p_columns], on=["user_id"])
    
    return users_df, user_features
    

users_df, user_features = prepare_users_df(interactions_df)

print(user_features)

display(HTML(users_df.loc[users_df['user_id'].isin([706, 1736, 7779, 96, 1, 50, 115])].head(15).to_html()))

['user_term_WinterVacation', 'user_term_Easter', 'user_term_OffSeason', 'user_term_HighSeason', 'user_term_LowSeason', 'user_term_MayLongWeekend', 'user_term_NewYear', 'user_term_Christmas', 'user_length_of_stay_bucket_[0-1]', 'user_length_of_stay_bucket_[2-3]', 'user_length_of_stay_bucket_[4-7]', 'user_length_of_stay_bucket_[8-inf]', 'user_rate_plan_Standard', 'user_rate_plan_Nonref', 'user_room_segment_[0-160]', 'user_room_segment_[160-260]', 'user_room_segment_[260-360]', 'user_room_segment_[360-500]', 'user_room_segment_[500-900]', 'user_n_people_bucket_[1-1]', 'user_n_people_bucket_[2-2]', 'user_n_people_bucket_[3-4]', 'user_n_people_bucket_[5-inf]', 'user_weekend_stay_True', 'user_weekend_stay_False']

	user_id	user_term_WinterVacation	user_term_Easter	user_term_OffSeason	user_term_HighSeason	user_term_LowSeason	user_term_MayLongWeekend	user_term_NewYear	user_term_Christmas	user_length_of_stay_bucket_[0-1]	user_length_of_stay_bucket_[2-3]	user_length_of_stay_bucket_[4-7]	user_length_of_stay_bucket_[8-inf]	user_rate_plan_Standard	user_rate_plan_Nonref	user_room_segment_[0-160]	user_room_segment_[160-260]	user_room_segment_[260-360]	user_room_segment_[360-500]	user_room_segment_[500-900]	user_n_people_bucket_[1-1]	user_n_people_bucket_[2-2]	user_n_people_bucket_[3-4]	user_n_people_bucket_[5-inf]	user_weekend_stay_True	user_weekend_stay_False
0	1	0.130435	0.0	0.652174	0.086957	0.130435	0.000000	0.000000	0.000000	0.000000	0.608696	0.391304	0.000000	0.521739	0.478261	0.000000	0.869565	0.130435	0.000000	0.0	0.000000	0.739130	0.173913	0.086957	0.782609	0.217391
47	50	0.043478	0.0	0.434783	0.304348	0.217391	0.000000	0.000000	0.000000	0.000000	0.913043	0.086957	0.000000	0.260870	0.739130	0.000000	0.565217	0.434783	0.000000	0.0	0.000000	0.173913	0.521739	0.304348	0.782609	0.217391
92	96	0.083333	0.0	0.708333	0.125000	0.041667	0.041667	0.000000	0.000000	0.250000	0.666667	0.041667	0.041667	0.291667	0.708333	0.125000	0.791667	0.083333	0.000000	0.0	0.041667	0.333333	0.541667	0.083333	0.750000	0.250000
111	115	0.727273	0.0	0.272727	0.000000	0.000000	0.000000	0.000000	0.000000	0.500000	0.363636	0.136364	0.000000	1.000000	0.000000	0.000000	0.818182	0.181818	0.000000	0.0	0.818182	0.090909	0.045455	0.045455	0.363636	0.636364
675	706	0.091988	0.0	0.451039	0.189911	0.207715	0.038576	0.011869	0.008902	0.169139	0.459941	0.272997	0.097923	0.994065	0.005935	0.020772	0.839763	0.130564	0.008902	0.0	0.041543	0.094955	0.738872	0.124629	0.676558	0.323442
1699	1736	0.034483	0.0	0.482759	0.206897	0.275862	0.000000	0.000000	0.000000	0.241379	0.551724	0.206897	0.000000	0.172414	0.827586	0.000000	0.931034	0.068966	0.000000	0.0	0.379310	0.413793	0.206897	0.000000	0.448276	0.551724
7639	7779	0.037037	0.0	0.296296	0.259259	0.370370	0.000000	0.000000	0.037037	0.111111	0.296296	0.481481	0.111111	1.000000	0.000000	0.000000	0.814815	0.185185	0.000000	0.0	0.000000	0.037037	0.740741	0.222222	0.814815	0.185185

(Optional) Prepare numerical item features

The method below is left here for convenience if you want to experiment with content-based item features as an input for your neural network.

def map_items_to_onehot(df):
    one_hot = pd.get_dummies(df.loc[:, base_item_features])
    df = df.drop(base_item_features, axis = 1)
    df = df.join(one_hot)
    
    return df, list(one_hot.columns)

def prepare_items_df(interactions_df):
    items_df = interactions_df.loc[:, ["item_id"] + base_item_features].drop_duplicates()
    
    items_df, item_features = map_items_to_onehot(items_df)
    
    return items_df, item_features


items_df, item_features = prepare_items_df(interactions_df)

print(item_features)

display(HTML(items_df.loc[items_df['item_id'].isin([0, 1, 2, 3, 4, 5, 6])].head(15).to_html()))

['term_WinterVacation', 'term_Easter', 'term_OffSeason', 'term_HighSeason', 'term_LowSeason', 'term_MayLongWeekend', 'term_NewYear', 'term_Christmas', 'length_of_stay_bucket_[0-1]', 'length_of_stay_bucket_[2-3]', 'length_of_stay_bucket_[4-7]', 'length_of_stay_bucket_[8-inf]', 'rate_plan_Standard', 'rate_plan_Nonref', 'room_segment_[0-160]', 'room_segment_[160-260]', 'room_segment_[260-360]', 'room_segment_[360-500]', 'room_segment_[500-900]', 'n_people_bucket_[1-1]', 'n_people_bucket_[2-2]', 'n_people_bucket_[3-4]', 'n_people_bucket_[5-inf]', 'weekend_stay_True', 'weekend_stay_False']

	item_id	term_WinterVacation	term_Easter	term_OffSeason	term_HighSeason	term_LowSeason	term_MayLongWeekend	term_NewYear	term_Christmas	length_of_stay_bucket_[0-1]	length_of_stay_bucket_[2-3]	length_of_stay_bucket_[4-7]	length_of_stay_bucket_[8-inf]	rate_plan_Standard	rate_plan_Nonref	room_segment_[0-160]	room_segment_[160-260]	room_segment_[260-360]	room_segment_[360-500]	room_segment_[500-900]	n_people_bucket_[1-1]	n_people_bucket_[2-2]	n_people_bucket_[3-4]	n_people_bucket_[5-inf]	weekend_stay_True	weekend_stay_False
0	0	1	0	0	0	0	0	0	0	0	1	0	0	1	0	0	0	1	0	0	0	0	0	1	1	0
1	1	1	0	0	0	0	0	0	0	0	1	0	0	1	0	0	1	0	0	0	0	0	1	0	1	0
2	2	1	0	0	0	0	0	0	0	0	1	0	0	1	0	0	1	0	0	0	0	1	0	0	0	1
3	3	1	0	0	0	0	0	0	0	0	0	1	0	1	0	0	1	0	0	0	0	0	1	0	1	0
4	4	1	0	0	0	0	0	0	0	0	0	1	0	1	0	1	0	0	0	0	0	1	0	0	1	0
5	5	0	1	0	0	0	0	0	0	0	0	1	0	1	0	0	0	1	0	0	0	0	0	1	1	0
6	6	0	0	1	0	0	0	0	0	0	1	0	0	1	0	0	0	1	0	0	0	0	0	1	1	0

Neural network recommender

Task:
Code a recommender based on a neural network model. You are free to choose any network architecture you find appropriate. The network can use the interaction vectors for users and items, embeddings of users and items, as well as user and item features (you can use the features you developed in the first project).

Remember to keep control over randomness - in the init method add the seed as a parameter and initialize the random seed generator with that seed (both for numpy and pytorch):

self.seed = seed
self.rng = np.random.RandomState(seed=seed)

in the network model:

self.seed = torch.manual_seed(seed)

You are encouraged to experiment with:

• the number of layers in the network, the number of neurons and different activation functions,
• different optimizers and their parameters,
• batch size and the number of epochs,
• embedding layers,
• content-based features of both users and items.

from recommenders.recommender import Recommender


# HR10 = 0.07
# class Net(nn.Module):
#     def __init__(self, features_len, output_len):
#         super(Net, self).__init__()
        
#         self.fc1 = nn.Linear(features_len, 150)
#         self.fc2 = nn.Linear(150, 100)
#         self.fc3 = nn.Linear(100, output_len)
#         self.fc4 = nn.Linear(output_len, output_len+200)
        
#         self.dropout = nn.Dropout(p=0.5)
        
#     def forward(self, x):
#         x = F.relu(self.fc1(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc2(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc3(x))
#         return self.fc4(x)

# HR10 = 0.06
# class Net(nn.Module):
#     def __init__(self, features_len, output_len):
#         super(Net, self).__init__()
        
#         self.fc1 = nn.Linear(features_len, 150)
#         self.fc2 = nn.Linear(150, 100)
#         self.fc3 = nn.Linear(100, output_len)
#         self.fc4 = nn.Linear(output_len, output_len+150)

#         self.dropout = nn.Dropout(p=0.5)
        
#     def forward(self, x):
#         x = F.relu(self.fc1(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc2(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc3(x))
#         x = self.dropout(x)
#         return self.fc4(x)

# Softmax very bad choice for multiclassification
# class Net(nn.Module):
#     def __init__(self, features_len, output_len):
#         super(Net, self).__init__()
        
#         self.fc1 = nn.Linear(features_len, 150)
#         self.fc2 = nn.Linear(150, 100)
#         self.fc3 = nn.Linear(100, output_len)
#         self.fc4 = nn.Linear(output_len, output_len+200)
        
#         self.dropout = nn.Dropout(p=0.5)
#         self.softmax = nn.Softmax()
        
#     def forward(self, x):
#         x = F.relu(self.fc1(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc2(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc3(x))
#         x = self.fc4(x)
#         x = self.softmax(x)
#         return x
    
# HR10 = 0.116 EPOCH 20000
# class Net(nn.Module):
#     def __init__(self, features_len, output_len):
#         super(Net, self).__init__()
        
#         self.fc1 = nn.Linear(features_len, 150)
#         self.fc2 = nn.Linear(150, 100)
#         self.fc3 = nn.Linear(100, output_len)
#         self.fc4 = nn.Linear(output_len, output_len+200)
        
#         self.dropout = nn.Dropout(p=0.5)
        
#     def forward(self, x):
#         x = F.relu(self.fc1(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc2(x))
#         x = self.dropout(x)
#         x = F.relu(self.fc3(x))
#         return self.fc4(x)
    
class Net(nn.Module):
    def __init__(self, features_len, output_len):
        super(Net, self).__init__()
        
        self.fc1 = nn.Linear(features_len, 150)
        self.fc2 = nn.Linear(150, 100)
        self.fc3 = nn.Linear(100, output_len)
        self.fc4 = nn.Linear(output_len, output_len+200)
        
        self.dropout = nn.Dropout(p=0.5)
        self.prelu = nn.PReLU()
        
    def forward(self, x):
        x = self.fc1(x)
        x = self.prelu(x)
        x = self.dropout(x)
        x = self.fc2(x)
        x = self.prelu(x)
        x = self.dropout(x)
        x = self.fc3(x)
        x = self.prelu(x)
        return self.fc4(x)
    
class NNRecommender(Recommender):
    """
    Linear recommender class based on user and item features.
    """
 
    def __init__(self, seed=6789, n_neg_per_pos=5, n_epochs=20000, lr=0.01):
        """
        Initialize base recommender params and variables.
        """
        self.model = None
        self.n_neg_per_pos = n_neg_per_pos
 
        self.recommender_df = pd.DataFrame(columns=['user_id', 'item_id', 'score'])
        self.users_df = None
        self.user_features = None
 
        self.seed = seed
        self.rng = np.random.RandomState(seed=seed)
        
        self.n_epochs = n_epochs
        self.lr = lr
 
    def calculate_accuracy(self, y_true, y_pred):
        predictions=(y_pred.argmax(1))
        return (predictions == y_true).sum().float() / len(y_true)
 
    def round_tensor(self, t, decimal_places=3):
        return round(t.item(), decimal_places)
 
    def fit(self, interactions_df, users_df, items_df):
        """
        Training of the recommender.
 
        :param pd.DataFrame interactions_df: DataFrame with recorded interactions between users and items 
            defined by user_id, item_id and features of the interaction.
        :param pd.DataFrame users_df: DataFrame with users and their features defined by user_id and the user feature columns.
        :param pd.DataFrame items_df: DataFrame with items and their features defined by item_id and the item feature columns.
        """
 
        interactions_df = interactions_df.copy()
        # Prepare users_df and items_df 
        # (optional - use only if you want to train a hybrid model with content-based features)
 
        users_df, user_features = prepare_users_df(interactions_df)
 
        self.users_df = users_df
        self.user_features = user_features
 
        items_df, item_features = prepare_items_df(interactions_df)
        items_df = items_df.loc[:, ['item_id'] + item_features]
 
        X = items_df[['term_WinterVacation', 'term_Easter', 'term_OffSeason', 'term_HighSeason', 'term_LowSeason', 'term_MayLongWeekend', 'term_NewYear', 'term_Christmas', 'rate_plan_Standard', 'rate_plan_Nonref', 'room_segment_[0-160]', 'room_segment_[160-260]', 'room_segment_[260-360]', 'room_segment_[360-500]', 'room_segment_[500-900]', 'n_people_bucket_[1-1]', 'n_people_bucket_[2-2]', 'n_people_bucket_[3-4]', 'n_people_bucket_[5-inf]', 'weekend_stay_True', 'weekend_stay_False']]
        y = items_df[['item_id']]
        X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=self.seed)
 
        X_train = torch.from_numpy(X_train.to_numpy()).float()
        y_train = torch.squeeze(torch.from_numpy(y_train.to_numpy()).long())
        X_test = torch.from_numpy(X_test.to_numpy()).float()
        y_test = torch.squeeze(torch.from_numpy(y_test.to_numpy()).long())
 
        self.net = Net(X_train.shape[1], items_df['item_id'].unique().size)
 
        optimizer = optim.Adam(self.net.parameters(), lr=self.lr)
        criterion = nn.CrossEntropyLoss()
 
        for epoch in range(self.n_epochs):
            y_pred = self.net(X_train)
            y_pred = torch.squeeze(y_pred)
            train_loss = criterion(y_pred, y_train)
 
            if epoch % 1000 == 0:
                y_test_pred = self.net(X_test)
                y_test_pred = torch.squeeze(y_test_pred)
                test_loss = criterion(y_test_pred, y_test)
                print(
        f'''epoch {epoch}
        Train set - loss: {self.round_tensor(train_loss)}
        Test  set - loss: {self.round_tensor(test_loss)}
        ''')
 
            optimizer.zero_grad()
            train_loss.backward()
            optimizer.step()
 
    def recommend(self, users_df, items_df, n_recommendations=1):
        """
        Serving of recommendations. Scores items in items_df for each user in users_df and returns 
        top n_recommendations for each user.
 
        :param pd.DataFrame users_df: DataFrame with users and their features for which recommendations should be generated.
        :param pd.DataFrame items_df: DataFrame with items and their features which should be scored.
        :param int n_recommendations: Number of recommendations to be returned for each user.
        :return: DataFrame with user_id, item_id and score as columns returning n_recommendations top recommendations 
            for each user.
        :rtype: pd.DataFrame
        """
 
        # Clean previous recommendations (iloc could be used alternatively)
        self.recommender_df = self.recommender_df[:0]
 
        # Prepare users_df and items_df
        # (optional - use only if you want to train a hybrid model with content-based features)
 
        users_df = users_df.loc[:, 'user_id']
        users_df = pd.merge(users_df, self.users_df, on=['user_id'], how='left').fillna(0)
 
        #         items_df, item_features = prepare_items_df(items_df)
        #         items_df = items_df.loc[:, ['item_id'] + item_features]
 
        # Score the items
 
        recommendations = pd.DataFrame(columns=['user_id', 'item_id', 'score'])
 
        for ix, user in users_df.iterrows():
            prep_user = torch.from_numpy(user[['user_term_WinterVacation', 'user_term_Easter', 'user_term_OffSeason', 'user_term_HighSeason', 'user_term_LowSeason', 'user_term_MayLongWeekend', 'user_term_NewYear', 'user_term_Christmas', 'user_rate_plan_Standard', 'user_rate_plan_Nonref', 'user_room_segment_[0-160]', 'user_room_segment_[160-260]', 'user_room_segment_[260-360]', 'user_room_segment_[360-500]', 'user_room_segment_[500-900]', 'user_n_people_bucket_[1-1]', 'user_n_people_bucket_[2-2]', 'user_n_people_bucket_[3-4]', 'user_n_people_bucket_[5-inf]', 'user_weekend_stay_True', 'user_weekend_stay_False']].to_numpy()).float()
            
            scores = self.net(prep_user).detach().numpy()
 
            chosen_ids = np.argsort(-scores)[:n_recommendations]
 
            recommendations = []
            for item_id in chosen_ids:
                recommendations.append(
                    {
                        'user_id': user['user_id'],
                        'item_id': item_id,
                        'score': scores[item_id]
                    }
                )
 
            user_recommendations = pd.DataFrame(recommendations)
 
            self.recommender_df = pd.concat([self.recommender_df, user_recommendations])
 
        return self.recommender_df

# Fit method
# nn_recommender = NNRecommender(10000, 0.02)
# nn_recommender.fit(interactions_df.head(1000), None, None)
# nn_recommender.fit(interactions_df, None, None)

Quick test of the recommender

items_df = interactions_df.loc[:, ['item_id'] + base_item_features].drop_duplicates()

# Fit method
nn_recommender = NNRecommender(n_epochs=200, lr=0.01)
nn_recommender.fit(interactions_df.head(1000), None, None)
# nn_recommender.fit(interactions_df, None, None)

epoch 0
        Train set - loss: 6.042, accuracy: 0.011
        Test  set - loss: 6.025, accuracy: 0.0
        
epoch 100
        Train set - loss: 1.162, accuracy: 0.506
        Test  set - loss: 36.526, accuracy: 0.0
        

# Recommender method

recommendations = nn_recommender.recommend(pd.DataFrame([[1],[3]], columns=['user_id']), items_df, 3)

recommendations = pd.merge(recommendations, items_df, on='item_id', how='left')
display(HTML(recommendations.to_html()))

	user_id	item_id	score	term	length_of_stay_bucket	rate_plan	room_segment	n_people_bucket	weekend_stay
0	1.0	119	5.364058	Easter	[2-3]	Standard	[160-260]	[2-2]	True
1	1.0	88	5.033441	WinterVacation	[0-1]	Standard	[160-260]	[2-2]	True
2	1.0	57	4.771185	WinterVacation	[2-3]	Standard	[160-260]	[2-2]	True
3	3.0	2	11.286193	WinterVacation	[2-3]	Standard	[160-260]	[2-2]	False
4	3.0	74	10.848604	WinterVacation	[4-7]	Standard	[160-260]	[2-2]	False
5	3.0	81	10.656947	WinterVacation	[0-1]	Standard	[160-260]	[2-2]	False

Tuning method

from evaluation_and_testing.testing import evaluate_train_test_split_implicit

seed = 6789

from hyperopt import hp, fmin, tpe, Trials
import traceback

def tune_recommender(recommender_class, interactions_df, items_df, 
                     param_space, max_evals=1, show_progressbar=True, seed=6789):
    # Split into train_validation and test sets

    shuffle = np.arange(len(interactions_df))
    rng = np.random.RandomState(seed=seed)
    rng.shuffle(shuffle)
    shuffle = list(shuffle)

    train_test_split = 0.8
    split_index = int(len(interactions_df) * train_test_split)

    train_validation = interactions_df.iloc[shuffle[:split_index]]
    test = interactions_df.iloc[shuffle[split_index:]]

    # Tune

    def loss(tuned_params):
        recommender = recommender_class(seed=seed, **tuned_params)
        hr1, hr3, hr5, hr10, ndcg1, ndcg3, ndcg5, ndcg10 = evaluate_train_test_split_implicit(
            recommender, train_validation, items_df, seed=seed)
        return -hr10

    n_tries = 1
    succeded = False
    try_id = 0
    while not succeded and try_id < n_tries:
        try:
            trials = Trials()
            best_param_set = fmin(loss, space=param_space, algo=tpe.suggest, 
                                  max_evals=max_evals, show_progressbar=show_progressbar, trials=trials, verbose=True)
            succeded = True
        except:
            traceback.print_exc()
            try_id += 1
            
    if not succeded:
        return None
        
    # Validate
    
    recommender = recommender_class(seed=seed, **best_param_set)

    results = [[recommender_class.__name__] + list(evaluate_train_test_split_implicit(
        recommender, {'train': train_validation, 'test': test}, items_df, seed=seed))]

    results = pd.DataFrame(results, 
                           columns=['Recommender', 'HR@1', 'HR@3', 'HR@5', 'HR@10', 'NDCG@1', 'NDCG@3', 'NDCG@5', 'NDCG@10'])

    display(HTML(results.to_html()))
    
    return best_param_set

Tuning of the recommender

Task:
Tune your model using the code below. You only need to put the class name of your recommender and choose an appropriate parameter space.

param_space = {
    'n_neg_per_pos': hp.quniform('n_neg_per_pos', 1, 10, 1)
}
items_df['item_id'].unique().size

best_param_set = tune_recommender(NNRecommender, interactions_df, items_df,
                                  param_space, max_evals=10, show_progressbar=True, seed=seed)

print("Best parameters:")
print(best_param_set)

epoch 0                                               
        Train set - loss: 6.797
        Test  set - loss: 6.793
        
epoch 1000                                            
        Train set - loss: 1.009
        Test  set - loss: 29.285
        
epoch 2000                                            
        Train set - loss: 1.055
        Test  set - loss: 30.205
        
epoch 3000                                            
        Train set - loss: 0.971
        Test  set - loss: 35.335
        
epoch 4000                                            
        Train set - loss: 0.948
        Test  set - loss: 35.459
        
epoch 5000                                            
        Train set - loss: 0.927
        Test  set - loss: 35.575
        
epoch 6000                                            
        Train set - loss: 0.968
        Test  set - loss: 37.951
        
epoch 7000                                            
        Train set - loss: 0.963
        Test  set - loss: 50.067
        
epoch 8000                                            
        Train set - loss: 0.919
        Test  set - loss: 48.694
        
epoch 9000                                            
        Train set - loss: 0.888
        Test  set - loss: 51.907
        
epoch 10000                                           
        Train set - loss: 4.246
        Test  set - loss: 115.464
        
epoch 11000                                           
        Train set - loss: 0.911
        Test  set - loss: 57.464
        
epoch 12000                                           
        Train set - loss: 0.872
        Test  set - loss: 64.896
        
epoch 13000                                           
        Train set - loss: 0.931
        Test  set - loss: 52.029
        
epoch 14000                                           
        Train set - loss: 1.024
        Test  set - loss: 56.175
        
  0%|          | 0/10 [18:33<?, ?trial/s, best loss=?]
Best parameters:
None

Traceback (most recent call last):
  File "<ipython-input-311-164530239fdf>", line 33, in tune_recommender
    best_param_set = fmin(loss, space=param_space, algo=tpe.suggest,
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/fmin.py", line 507, in fmin
    return trials.fmin(
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/base.py", line 682, in fmin
    return fmin(
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/fmin.py", line 553, in fmin
    rval.exhaust()
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/fmin.py", line 356, in exhaust
    self.run(self.max_evals - n_done, block_until_done=self.asynchronous)
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/fmin.py", line 292, in run
    self.serial_evaluate()
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/fmin.py", line 170, in serial_evaluate
    result = self.domain.evaluate(spec, ctrl)
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/hyperopt/base.py", line 907, in evaluate
    rval = self.fn(pyll_rval)
  File "<ipython-input-311-164530239fdf>", line 23, in loss
    hr1, hr3, hr5, hr10, ndcg1, ndcg3, ndcg5, ndcg10 = evaluate_train_test_split_implicit(
  File "/home/jovyan/REK/evaluation_and_testing/testing.py", line 93, in evaluate_train_test_split_implicit
    recommender.fit(interactions_df_train, None, items_df)
  File "<ipython-input-446-dd9ef74b6c5d>", line 192, in fit
    train_loss.backward()
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/torch/tensor.py", line 245, in backward
    torch.autograd.backward(self, gradient, retain_graph, create_graph, inputs=inputs)
  File "/opt/conda/envs/rek_uno/lib/python3.8/site-packages/torch/autograd/__init__.py", line 145, in backward
    Variable._execution_engine.run_backward(
KeyboardInterrupt

Final evaluation

Task:
Run the final evaluation of your recommender and present its results against the Amazon and Netflix recommenders' results. You just need to give the class name of your recommender and its tuned parameters below.

nn_recommender = NNRecommender(n_neg_per_pos=6, n_epochs=20000)  # Initialize your recommender here

# Give the name of your recommender in the line below
nn_tts_results = [['NNRecommender'] + list(evaluate_train_test_split_implicit(
    nn_recommender, interactions_df, items_df))]

nn_tts_results = pd.DataFrame(
    nn_tts_results, columns=['Recommender', 'HR@1', 'HR@3', 'HR@5', 'HR@10', 'NDCG@1', 'NDCG@3', 'NDCG@5', 'NDCG@10'])

display(HTML(nn_tts_results.to_html()))

epoch 0
        Train set - loss: 6.842
        Test  set - loss: 6.843
        

from recommenders.amazon_recommender import AmazonRecommender

amazon_recommender = AmazonRecommender()

amazon_tts_results = [['AmazonRecommender'] + list(evaluate_train_test_split_implicit(
    amazon_recommender, interactions_df, items_df))]

amazon_tts_results = pd.DataFrame(
    amazon_tts_results, columns=['Recommender', 'HR@1', 'HR@3', 'HR@5', 'HR@10', 'NDCG@1', 'NDCG@3', 'NDCG@5', 'NDCG@10'])

display(HTML(amazon_tts_results.to_html()))

	Recommender	HR@1	HR@3	HR@5	HR@10	NDCG@1	NDCG@3	NDCG@5	NDCG@10
0	AmazonRecommender	0.042119	0.10464	0.140507	0.199408	0.042119	0.076826	0.091797	0.110711

from recommenders.netflix_recommender import NetflixRecommender

netflix_recommender = NetflixRecommender(n_epochs=30, print_type='live')

netflix_tts_results = [['NetflixRecommender'] + list(evaluate_train_test_split_implicit(
    netflix_recommender, interactions_df, items_df))]

netflix_tts_results = pd.DataFrame(
    netflix_tts_results, columns=['Recommender', 'HR@1', 'HR@3', 'HR@5', 'HR@10', 'NDCG@1', 'NDCG@3', 'NDCG@5', 'NDCG@10'])

display(HTML(netflix_tts_results.to_html()))

Loss
	training         	 (min:    0.161, max:    0.228, cur:    0.161)
	validation       	 (min:    0.176, max:    0.242, cur:    0.177)

	Recommender	HR@1	HR@3	HR@5	HR@10	NDCG@1	NDCG@3	NDCG@5	NDCG@10
0	NetflixRecommender	0.042777	0.106614	0.143139	0.200395	0.042777	0.078228	0.093483	0.111724

tts_results = pd.concat([nn_tts_results, amazon_tts_results, netflix_tts_results]).reset_index(drop=True)
display(HTML(tts_results.to_html()))

	Recommender	HR@1	HR@3	HR@5	HR@10	NDCG@1	NDCG@3	NDCG@5	NDCG@10
0	NNRecommender	0.025008	0.035209	0.066469	0.116815	0.025008	0.031100	0.043697	0.059459
1	AmazonRecommender	0.042119	0.104640	0.140507	0.199408	0.042119	0.076826	0.091797	0.110711
2	NetflixRecommender	0.042777	0.106614	0.143139	0.200395	0.042777	0.078228	0.093483	0.111724

Summary

Task:
Write a summary of your experiments. What worked well and what did not? What are your thoughts how could you possibly further improve the model?

What did not work:

• I tried to use softmax, it wasn't good idea
• Firstly, I copy and paste without thinking some code from tutorial for binary linear regresion. BCELoss is not a good idea for mutli-classification.
• More layers don't mean better results.
• More epochs don't always mean better results.

What did work well:

• Dropout layer increased results significantly (from HR@10 0.03 to 0.116).

• Using all features give me best results.

  How to further improve model:

• Add more data or more features

• Work on network layout