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DCN-R: как объединить Deep & Cross-модель и ResNet-подход для улучшения рекомендаций

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Мотивация и постановка задачи

В индустрии путешествий выбор отеля определяется не только ценой или фотографиями, но и уровнем доверия к источнику рекомендаций. Официальные отзывы часто кажутся обезличенными, а алгоритмические подборки - слишком «машинными» и лишёнными человеческого контекста.

В то же время мы знаем, что рекомендации от друзей и знакомых воспринимаются куда более надёжными и релевантными. Однако большинство сервисов бронирования до сих пор не имеют удобных инструментов для сбора и использования такого социально обусловленного опыта. В итоге путешественники спрашивают советы напрямую у друзей, ищут рекомендации на форумах или опираются на случайные видео в соцсетях. Мне хотелось предоставить пользователям социально персонализированные рекомендации, которые увеличивают вовлечённость, доверие и вероятность бронирования.

Функциональность «Друзья рекомендуют» призвана закрыть этот разрыв: она позволяет путешественнику получать персонализированные рекомендации отелей на основе опыта и отзывов его друзей и знакомых. Такой механизм даёт пользователю возможность:

  • находить отели, в которых действительно останавливались его друзья;

  • читать свежие, надёжные и лично релевантные отзывы.

Функциональная цель

Мы поставили задачу разработать прототип системы «Друзья рекомендуют» - сервиса, который позволяет пользователю находить отели, в которых бывали его друзья, подписчики или коллеги, и просматривать их отзывы.

User Stories

  • Как путешественник, я хочу видеть рекомендации отелей от своих друзей, чтобы быть уверенным в их качестве и актуальности.

  • Как владелец отеля, я хочу, чтобы довольные гости могли легко рекомендовать мой отель своим друзьям.

Поскольку у нас не было реального датасета социальной графовой структуры, мы решили сгенерировать его синтетически и протестировать различные архитектуры для обучения персонализированных рекомендаций. Это привело нас к разработке и оценке Deep & Cross Network with Residual Blocks (DCN-R) - гибридной модели, способной одновременно учитывать явные взаимодействия на основе друзей и скрытые латентные паттерны в поведении «пользователь–объект».

Абстракция

В промышленных рекомендательных системах данные, как правило, огромные, разреженные и табличные - и это создаёт ключевую проблему: необходимость одновременно обеспечивать эффективное запоминание и обобщение.
Запоминание - это обучение частым и явным совместно встречающимся признакам; она критически важна для точных рекомендаций, основанных на прямом, наблюдаемом сигнале.
Обобщение же - это способность обнаруживать новые, более сложные комбинации признаков, что необходимо для устойчивости модели и появления разнообразных, неожиданных рекомендаций.

Стандартные глубокие нейросети (DNN) превосходно справляются с обобщением, но плохо подходят для обучения простым и явным пересечениям признаков - слишком много параметров тратится неэффективно.

Чтобы решить этот конфликт, мы предлагаем Deep & Cross Network with Residual Blocks (DCN-R) - новую гибридную архитектуру, способную явно моделировать взаимодействия признаков всех порядков за счёт параллельной работы двух специализированных подсетей. Такая составная архитектура позволяет DCN-R формировать богатое и комплексное представление данных, достигая оптимального баланса между точностью рекомендаций и их разнообразием в задачах ранжирования.

1. Введение

Как я уже говорил, рекомендательные системы стали повсеместным и критически важным компонентом современного цифрового пространства, и их эффективность напрямую зависит от того, насколько хорошо они способны моделировать сложные пользовательские предпочтения и характеристики объектов в условиях масштабных, разреженных и высокоразмерных табличных данных. В основе этой задачи лежит фундаментальная архитектурная дилемма: баланс между запоминанием и обобщением. Давайте подробнее разберёмся, что именно здесь происходит.

Запоминание - это обучение прямым, часто встречающимся взаимодействиям между признаками, что позволяет эффективно использовать наблюдаемые в исторических данных паттерны. Обобщение, напротив, - это способность обнаруживать скрытые, более сложные комбинации признаков и применять это знание к новым, ранее невстречавшимся ситуациям, что критически важно для разнообразия и устойчивости рекомендаций.

Оригинальная Deep & Cross Network (DCN) и её преемник DCN-V2 успешно решали задачу явного пересечения признаков, однако их «глубокая» часть обычно строится на стандартном многослойном перцептроне (MLP). И хотя такой подход работает, он потенциально создаёт узкое место в представлениях. По мере увеличения сложности скрытых пользовательских предпочтений простой MLP может оказаться недостаточно глубоким и выразительным: ему становится сложно обучать богатые представления, а обучение начинает страдать от деградации градиентов и проблем с оптимизацией.

В этой статье мы представляем Deep & Cross Network with Residual Blocks (DCN-R) -архитектуру, которая напрямую устраняет указанное ограничение. Наша основная гипотеза состоит в том, что замена стандартного MLP на глубокую сеть, построенную из остаточных блоков (Residual Blocks, ResBlocks), позволяет существенно усилить способность модели к обобщению.

Благодаря skip-connection, inherent в ResBlocks, такая архитектура обеспечивает стабильное обучение гораздо более глубоких сетей. Это позволяет модели захватывать более сложные и высокоуровневые абстракции признаков, чем это возможно в рамках обычного MLP.

Наши основные вклад в работе состоит в следующем:

  1. Интеграция Residual Blocks в глубокий компонент DCN-подобной архитектуры, что усиливает способность модели захватывать сложные, высокопорядковые абстракции признаков.

  2. Разработка полного, сквозного описания архитектуры модели, методологии обучения и пайплайна инференса, что обеспечивает воспроизводимость и прозрачность экспериментов.

  3. Эмпирическая проверка архитектурных решений через абляционное исследование, демонстрирующее необходимость как гибридной структуры, так и остаточных связей для достижения оптимальной производительности.

Связанные работы

Архитектура DCN-R опирается на обширную линию исследований в области глубокого обучения для рекомендательных систем, объединяя несколько влиятельных парадигм в единый согласованный подход.

Ранний прогресс в этом направлении был связан с работой Wide & Deep Learning, предложенной Google - одной из ключевых разработок, представившей идею гибридных архитектур, сочетающих простой линейный компонент (Wide, отвечающий за запоминание) с глубокой нейронной сетью (Deep, отвечающей за обобщение). Эта концепция заложила основу для балансировки явных взаимодействий между признаками и обучения скрытых представлений.

Развивая идеи, популяризированные Google, Factorization Machines (FM) предложили элегантный и вычислительно эффективный механизм моделирования взаимодействий второго порядка. Их нейронное расширение - DeepFM - объединило сильные стороны FM и глубоких сетей, позволив модели одновременно изучать низко и высокоуровневые взаимодействия. Однако и эти архитектуры имели ограничения: они не обеспечивали систематичного моделирования взаимодействий более высоких порядков.

Чтобы преодолеть эти ограничения, Deep & Cross Network (DCN) ввела компонент Cross Network - обучаемый и более общий механизм пересечения признаков, фактически заменивший ручное проектирование Wide-части автоматизированной альтернативой. Позднее появились модели вроде AutoInt, которые исследовали подходы, основанные на внимании: используя self-attention, они обучались определять относительную важность различных комбинаций признаков. Несмотря на высокую выразительность, такие механизмы внимания моделируют взаимодействия неявно, что часто снижает интерпретируемость и усложняет структурный контроль.

В нашей работе мы уточняем и расширяем парадигму DCN, усиливая её способность к обобщению за счёт интеграции остаточных соединений - проверенной архитектурной техники, широко применяемой в компьютерном зрении. Объединяя преимущества явного моделирования пересечений признаков и стабильного распространения градиента, DCN-R обеспечивает более сбалансированную и расширяемую структуру для обучения представлений.

3. Общая архитектура и поток данных

DCN-R спроектирована как многопоточный пайплайн обучения признаков, цель которого - сформировать единый, высокоточный ранжирующий скор. Архитектура модели представляет собой последовательный процесс, состоящий из четырёх основных этапов.

  1. Формирование входных данных и эмбеддингов: исходные признаки (коллаборативные, категориальные и числовые) преобразуются в единый плотный вектор x_0

  2. Параллельное извлечение признаков: вектор x0x0​ одновременно подаётся в два модуля - Cross Network для обучения явных взаимодействий и глубокую остаточную сеть для обучения скрытых абстракций.

  3. Слияние и объединение: выходные векторы обеих подсетей конкатенируются, формируя итоговое представление признаков.

  4. Финальное предсказание: к объединённому вектору применяется линейное преобразование, которое даёт единственный скалярный логит - итоговый ранжирующий скор.

    Такой параллельный дизайн позволяет модели одновременно изучать как явные пересечения признаков, так и скрытые глубокие паттерны.

Архитектура всей сети
Архитектура всей сети

4. Архитектурные компоненты в деталях

4.1. Input & Embedding Layer

Этот слой преобразует разреженный, разнородный вход в единый плотный числовой вектор x_0.

Обработка высокоразмерных категориальных признаков выполняется через эмбеддинги.
Такие признаки, как user_id и item_id, отображаются в обучаемые низкоразмерные векторные представления. Для каждого признака создаётся матрица эмбеддинговE∈R∣V∣×k, где ∣V∣ - размер словаря, а k - размерность эмбеддинга. Модель выполняет осмотр, извлекая соответствующий вектор для каждого индекса признака. Все матрицы эмбеддингов являются обучаемыми параметрами.
Непрерывные признаки, такие как price_rub, нормализуются с помощью Min–Max масштабирования в единый диапазон по формуле:

x'_{ij} = \frac{x_{ij} - \min(X_j)}{\max(X_j) - \min(X_j)}

Затем идет формирование итогового входного вектора x_0
Все эмбеддинги и нормализованные числовые признаки конкатенируются в единый итоговый вектор:

x_0 = [ emb(user_id) ⊕ emb(item_id) ⊕ ... ⊕ norm_numerical_features ]

где символ ⊕ обозначает операцию конкатенацию.

4.2. Компонент запоминания: Cross Network

Cross Network явно и эффективно обучаетcя взаимодействию признаков ограниченной степени. Он состоит из последовательности слоёв CrossLayer, каждый из которых определяется следующей формулой:

x_{l+1} = x_0 \odot (x_l^{\top} w_l) + b_l + x_l

Где:

  • x_l​, x_l + 1​∈R^d: выходные векторы из l-го и (l+1)- го слоёв Cross Network.

  • x_0​ ∈ R^d: исходный входной вектор, полученный из слоя эмбеддингов.

  • w_l​, b_l ∈ R^d: обучаемые параметры - веса и смещения для l- го слоя.

  • ⊙: поэлементное произведение (произведение Адамара).

Эта изящная формула позволяет Cross Network явно строить взаимодействия признаков порядка (l+1) на каждом слое l, используя всего O(d) параметров, что делает его чрезвычайно эффективным механизмом запоминания. Завершающий член +x_lвыступает как остаточное соединение, сохраняющее ранее выученные взаимодействия.

4.3. Компонент обобщения: глубокая остаточная сеть

Глубокая подсеть служит «движком» обобщения, предназначенным для выявления скрытых, неявных и высокоуровневых паттернов. Чтобы преодолеть проблему затухающего градиента в глубоких моделях, она построена на основе остаточных блоков (Residual Blocks, ResBlocks). Каждый такой блок вычисляет следующее преобразование:

x_{l+1} = \mathrm{ReLU}\!\bigl(F(x_l, W_l) + x_l\bigr)
#структура CrossLayer блока 
class CrossLayer(nn.Module):
    def __init__(self, input_dim):
        super().__init__()
        self.w = nn.Linear(input_dim, 1, bias=False)
        self.b = nn.Parameter(torch.zeros(input_dim))

    def forward(self, x):
        x_0 = x.unsqueeze(2)
        x_t = x.unsqueeze(1)
        return x_0.squeeze(2) + torch.matmul(x_0, self.w(x_t)).squeeze(2) + self.b

#структура ResBlock блока 

class ResBlock(nn.Module):
    def __init__(self, hidden_dim, dropout):
        super().__init__()
        self.layer1 = nn.Linear(hidden_dim, hidden_dim)
        self.bn1 = nn.BatchNorm1d(hidden_dim)
        self.relu = nn.ReLU()
        self.dropout = nn.Dropout(dropout)
        self.layer2 = nn.Linear(hidden_dim, hidden_dim)
        self.bn2 = nn.BatchNorm1d(hidden_dim)

    def forward(self, x):
        identity = x
        out = self.layer1(x)
        out = self.bn1(out)
        out = self.relu(out)
        out = self.dropout(out)
        out = self.layer2(out)
        out = self.bn2(out)
        out += identity
        out = self.relu(out)
        return out


class DCN_RecSys(nn.Module):
    def __init__(self, n_users, n_items, cat_dims, n_num_features, params):
        super().__init__()
        emb_dim = params['emb_dim']
        hidden_dim = params['hidden_dim']
        n_cross_layers = params['n_cross_layers']
        dropout = params['dropout']

       # Получить количество блоков ResNet из параметров
        n_res_blocks = params.get('n_res_blocks', 2) # По умолчанию 2, если не указано иное

        self.user_embedding = nn.Embedding(n_users, emb_dim)
        self.item_embedding = nn.Embedding(n_items, emb_dim)
        self.cat_embeddings = nn.ModuleList([
            nn.Embedding(n_cat, int(np.sqrt(n_cat)) + 1) for n_cat in cat_dims.values()])
        cat_emb_sum_dim = sum([int(np.sqrt(n_cat)) + 1 for n_cat in cat_dims.values()])
        input_dim = emb_dim * 2 + cat_emb_sum_dim + n_num_features

        self.initial_deep_layer = nn.Linear(input_dim, hidden_dim)

       #Создаем блоки ResNet в цикле и сохраняем их в ModuleList
        self.res_blocks = nn.ModuleList([
            ResBlock(hidden_dim, dropout) for _ in range(n_res_blocks)
        ])

        self.cross_network = nn.ModuleList([CrossLayer(input_dim) for _ in range(n_cross_layers)])

        final_dim = hidden_dim + input_dim
        self.final_linear = nn.Linear(final_dim, 1)

    def forward(self, user_ids, item_ids, cat_features, num_features):
        user_emb = self.user_embedding(user_ids)
        item_emb = self.item_embedding(item_ids)
        cat_embs = [emb(cat_features[:, i]) for i, emb in enumerate(self.cat_embeddings)]
        x_0 = torch.cat([user_emb, item_emb] + cat_embs + [num_features], dim=1)

        deep_out = self.initial_deep_layer(x_0)

       #Пропускаем данные через все блоки ResNet в цикле
        for res_block in self.res_blocks:
            deep_out = res_block(deep_out)

        cross_out = x_0
        for layer in self.cross_network: cross_out = layer(cross_out)
        final_input = torch.cat([deep_out, cross_out], dim=1)
        return self.final_linear(final_input).squeeze()

4.4. Слияние и выходной слой

На финальном этапе информация из обеих подсетей объединяется. Выходной вектор из последнего слоя Cross Network (cross_out) и выходной вектор из последнего Residual Block (deep_out) конкатенируются:

v_{\text{final}} = \bigl[\, \text{cross}_{\text{out}} \;\oplus\; \text{deep}_{\text{out}} \,\bigr]

Затем объединённый вектор проходит через финальный линейный слой с одним нейроном, который формирует неограниченный скалярный скор (логит):

\text{Score} = w_{\text{final}}^{\top} v_{\text{final}} + b_{\text{final}}

Финальная функция активации не используется, поскольку для задачи ранжирования важен лишь относительный порядок скора.

5. Методология обучения и экспериментальная проверка

5.1. Функция потерь

Хотя финальный вывод модели используется для ранжирования, обучение проводится как задача бинарной классификации: нужно предсказать вероятность положительного исхода (was_booked = 1). Для этого применяется функция Binary Cross-Entropy with Logits Loss (BCEWithLogitsLoss). Это стандартный выбор для бинарной классификации, обеспечивающий численную стабильность и хорошую сходимость.

Функция потерь L для батча из N примеров вычисляется как:

\mathcal{L}_{\text{BCE}} = \frac{1}{N} \sum_{i=1}^{N} \left( \max(\hat{y}_i, 0) - y_i \hat{y}_i + \log\!\left(1 + e^{-|\hat{y}_i|}\right) \right)

Где:

  • y_i​ - истинная бинарная метка (1 для was_booked, 0 в остальных случаях).

  • y_i - сырое скалярное значение (логит), выдаваемое моделью(y c крышкой^).

Хотя BCEWithLogitsLoss считается каноническим выбором для бинарной классификации, в нашей задаче финальный выход модели используется исключительно как ранжировочный скор. Для таких моделей, где важен именно порядок, а не калиброванная вероятность, MSE нередко выступает сильной и стабильной прокси-функцией потерь, поскольку цель состоит не в точном предсказании вероятностей, а в обеспечении правильного относительного упорядочивания объектов.

Мы эмпирически обнаружили, что MSE обеспечивает такую же или лучшую эффективность ранжирования на данном датасете.

5.2. Стратегия оптимизации

Мы используем оптимизатор AdamW, поскольку он более корректно обрабатывает регуляризацию через weight decay. Скорость обучения динамически изменяется с помощью планировщика ReduceLROnPlateau, который уменьшает learning rate, когда значение функции потерь на валидации перестаёт улучшаться.

# Цикл обучения и валидации с Optuna + early stopping
n_epochs, patience, best_val_loss, epochs_no_improve = 50, 5, float('inf'), 0

for epoch in range(n_epochs):
    model.train()
    for X_collab_b, X_cat_b, X_num_b, y_b in train_dl:
        user_ids = X_collab_b[:, 0].to(device)
        item_ids = X_collab_b[:, 1].to(device)
        cat_features = X_cat_b.to(device)
        num_features = X_num_b.to(device)
        y = y_b.to(device)

        optimizer.zero_grad()
        preds = model(user_ids, item_ids, cat_features, num_features)
        loss = loss_fn(preds, y.float())
        loss.backward()
        optimizer.step()

    # Валидация на полном валидационном сете
    model.eval()
    with torch.no_grad():
        user_ids_val = X_val_collab[:, 0].to(device)
        item_ids_val = X_val_collab[:, 1].to(device)
        cat_features_val = X_val_cat.to(device)
        num_features_val = X_val_num.to(device)

        preds = model(user_ids_val, item_ids_val, cat_features_val, num_features_val)
        val_loss = loss_fn(preds, y_val.to(device).float()).item()

    # Шедулер + репорт в Optuna
    scheduler.step(val_loss)
    trial.report(val_loss, epoch)

    if trial.should_prune():
        raise optuna.exceptions.TrialPruned()

    # Обновляем лучший чекпоинт
    if val_loss < best_val_loss:
        best_val_loss = val_loss
        epochs_no_improve = 0
        model_path = f"checkpoints/best_model_trial_{trial.number}.pth"
        torch.save(model.state_dict(), model_path)
        trial.set_user_attr("best_model_path", model_path)
    else:
        epochs_no_improve += 1

    # Простейший early stopping по валидации
    if epochs_no_improve >= patience:
        logging.info(f"Early stopping at epoch {epoch + 1} for trial {trial.number}")
        break

Экспериментальная методология и результаты

Чтобы обеспечить надёжность модели и подтвердить корректность архитектурных решений, мы провели строгий экспериментальный процесс, включающий автоматизированный подбор гиперпараметров и комплексное абляционное исследование.

Оптимизация гиперпараметров

def objective(trial, train_data_tensors, val_data_tensors, model_dims):
    X_train_collab, X_train_cat, X_train_num, y_train = train_data_tensors
    X_val_collab, X_val_cat, X_val_num, y_val = val_data_tensors
    n_users, n_items, cat_dims, n_num_features = model_dims

    # Поиск гиперпараметров через Optuna
    params = {
        'emb_dim': trial.suggest_categorical("emb_dim", [16, 24, 32, 48, 64]),
        'hidden_dim': trial.suggest_int("hidden_dim", 32, 512, step=32),
        'n_cross_layers': trial.suggest_int("n_cross_layers", 1, 6),
        'n_res_blocks': trial.suggest_int("n_res_blocks", 1, 4),
        'dropout': trial.suggest_float("dropout", 0.1, 0.7, step=0.05),

        'lr': trial.suggest_float("lr", 1e-5, 1e-2, log=True),
        'batch_size': trial.suggest_categorical("batch_size", [512, 1024, 2048, 4096]),
        'weight_decay': trial.suggest_float("weight_decay", 1e-6, 1e-1, log=True),
        'optimizer_name': trial.suggest_categorical("optimizer_name", ["AdamW", "Adam"]),

        'lr_scheduler_patience': trial.suggest_int("lr_scheduler_patience", 1, 3),
        'lr_scheduler_factor': trial.suggest_float("lr_scheduler_factor", 0.1, 0.5, step=0.1)
    }

    # Датасет и DataLoader под выбранный batch_size
    train_ds = TensorDataset(X_train_collab, X_train_cat, X_train_num, y_train)
    train_dl = DataLoader(train_ds, batch_size=params['batch_size'], shuffle=True)

    # Модель с текущим набором гиперпараметров
    model = DCN_RecSys(n_users, n_items, cat_dims, n_num_features, params).to(device)

    # Оптимизатор: AdamW или Adam
    if params['optimizer_name'] == 'AdamW':
        optimizer = torch.optim.AdamW(
            model.parameters(),
            lr=params['lr'],
            weight_decay=params['weight_decay']
        )
    else:
        optimizer = torch.optim.Adam(
            model.parameters(),
            lr=params['lr'],
            weight_decay=params['weight_decay']
        )

    # Лосс для бинарной классификации по логитам
    loss_fn = nn.BCEWithLogitsLoss()

    # ReduceLROnPlateau: режем lr, если val_loss не падает
    scheduler = torch.optim.lr_scheduler.ReduceLROnPlateau(
        optimizer,
        mode='min',
        patience=params['lr_scheduler_patience'],
        factor=params['lr_scheduler_factor']
    )

    # дальше идёт цикл обучения/валидации (см. выше)

Оптимальная комбинация архитектурных и тренировочных параметров была найдена с помощью фреймворка Optuna. Мы задали широкий поисковый диапазон для ключевых параметров,такихкак emb_dim, hidden_dim, n_cross_layers, n_res_blocks, dropout, lr и weight_decay. Процесс оптимизации, основанный на сэмплере TPE и механизме Median Pruner, был запущен на 300 итераций с применением ранней остановки.

История оптимизации. График показывает явную сходимость к низкому значению LogLoss = 0.1686, что демонстрирует эффективность автоматизированного подбора гиперпараметров.
История оптимизации. График показывает явную сходимость к низкому значению LogLoss = 0.1686, что демонстрирует эффективность автоматизированного подбора гиперпараметров.
Важность гиперпараметров. Результаты показывают, что параметры регуляризации (dropout, weight_decay) и скорость обучения оказались наиболее критичными для достижения хорошей обобщающей способности на нашем высоко-сигнальном датасете.
Важность гиперпараметров. Результаты показывают, что параметры регуляризации (dropout, weight_decay) и скорость обучения оказались наиболее критичными для достижения хорошей обобщающей способности на нашем высоко-сигнальном датасете.

Процесс оптимизации сошёлся на элегантной, эффективной и сильно регуляризованной архитектуре (dropout = 0.6, emb_dim = 16, n_res_blocks = 1), а не на модели «чем больше - тем лучше». Это идеально соответствует соотношению сигнал/шум в обучающих данных.

5.3. Абляционные исследования

Чтобы количественно оценить вклад каждого архитектурного компонента, мы провели серию абляционных экспериментов. Для каждого варианта модели выполнялся отдельный независимый подбор гиперпараметров (по 100 итераций на вариант).

Вариант модели

Описание

Best Val Logloss ↓

Best Val AUC ↑

DCN - R (Full Model)

Полная гибридная архитектура

0.1686

0.9526

Cross Network Only

Удалён компонент Deep Network

0.1886

0.9310

Deep Network Only

Удалён компонент Cross Network

0.1901

0.9204

DCN with standard MLP

ResBlocks заменены на стандартный MLP

0.1901

0.9292

(Примечание: более низкий LogLoss означает лучший результат, более высокий AUC - лучший результат.)

Анализ результатов

Абляционное исследование выявило несколько ключевых выводов:

1. Преобладание явных взаимодействий признаков.
Вариант «Cross Network Only» (Модель 2) продемонстрировал сильные результаты, что подчёркивает: предсказательный сигнал в нашем датасете действительно доминируется эксплицитными взаимодействиями признаков. Наша стратегия предварительной обработки данных сформировала «чистое» пространство, ориентированное на запоминание, в котором хорошо настроенный Cross Network показывает высокую эффективность.

2. Негативный эффект использования стандартного MLP.
Вариант «DCN with standard MLP» (Модель 4) показал худший AUC среди всех тестируемых архитектур. Это свидетельствует о том, что включение обычного MLP ухудшает работу Cross Network, вероятно вводя дополнительный шум и не обеспечивая достаточной выразительности.

3. Подтверждение эффективности архитектуры на основе Residual Blocks.
Полный вариант модели DCN-R (Модель 1) стал лучшей моделью среди всех протестированных конфигураций, значительно опередив как Cross-only, так и MLP-базовые варианты. Это демонстрирует устойчивость и выразительность глубокого компонента, построенного на Residual Blocks.
В отличие от стандартного MLP, ResNet-блоки способны усиливать обобщающую способность модели без деградации производительности, что подтверждает их преимущество в составе гибридной архитектуры.

5.4. Анализ оптимальных гиперпараметров

Процесс оптимизации гиперпараметров сошёлся к конфигурации, которая позволяет сделать важные выводы о поведении модели на нашем датасете:

  • dropout = 0.6 Выбор настолько высокого dropout подчёркивает высокую ёмкость модели и её склонность к переобучению на «чистом», предварительно отфильтрованном датасете. Optuna корректно определила, что сильная регуляризация является ключевым фактором для достижения хорошей обобщающей способности.

  • emb_dim = 16 Оптимизатор предпочёл минимальный доступный размер эмбеддинга. Это говорит о том, что компактного представления оказалось достаточно для передачи семантики пользователей и объектов, что делает модель параметрически более эффективной.

  • n_res_blocks = 1 Оптимальной оказалась сравнительно неглубокая модель с одним residual-блоком. Это означает, что для данной задачи не требуются чрезмерно глубокие абстракции, и одного мощного нелинейного преобразования достаточно.

  • batch_size = 512 Использование наименьшего размера батча выступает в роли стохастической регуляризации, помогая оптимизатору находить более устойчивый локальный минимум - что согласуется с общей необходимостью в сильной регуляризации.

Итог: процесс оптимизации не привёл к «максимально большой» модели, а наоборот - к элегантной, эффективной и сильно регуляризованной архитектуре, которая идеально соответствует соотношению сигнал/шум в данных.

6. Деплоймент-архитектура и API

Чтобы сделать обученную модель DCN-R доступной для реального использования, мы разработали и внедрили продакшн-готовую архитектуру деплоймента, основанную на принципах микросервисов.

6.1. Архитектура системы

Система состоит из двух основных сервисов, управляемых через Docker Compose:

1. ML-сервис (FastAPI)

Статлесс-сервис, инкапсулирующий весь ML-конвейер.
Его единственная задача - выполнять вычислительно сложные операции.
Он предоставляет два ключевых эндпоинта:

  • POST /recommendations
    Выполняет полный двухэтапный пайплайн рекомендаций
    (candidate generation → ranking)
    и возвращает персонализированный отсортированный список hotel_id.

  • GET /similar_items
    Вспомогательный эндпоинт, который находит отели, похожие на заданный item_id,
    используя k-NN-индекс, построенный на эмбеддингах отелей.

2. База данных (PostgreSQL)

Персистентное хранилище, содержащее все ключевые данные:

  • Пользователей

  • Отели

  • Отзывы

  • Связи друзей (friendships)

Такое раздельное построение сервисов гарантирует, что ML-логика остаётся полностью изолированной от основного backend-приложения. Это позволяет:

  • независимо масштабировать вычислительные мощности ML-сервиса

  • обновлять модель без остановки остальной системы

  • упрощать сопровождение и развёртывание

6.2. API и поток данных

Когда пользователь запрашивает рекомендации, процесс выглядит следующим образом:

  1. Браузер пользователя отправляет запрос в основной backend приложения (который не входит в этот репозиторий).

  2. Основной backend аутентифицирует пользователя и затем отправляет запрос POST в наш ML-сервис по адресу/recommendations, передавая user_id и city.

  3. ML-сервис обращается к базе данных PostgreSQL, чтобы получить необходимые данные: - список друзей пользователя, - их отзывы, - признаки отелей.

  4. ML-сервис выполняет полный пайплайн рекомендаций (генерация кандидатов + ранжирование) и возвращает отсортированный список hotel_id.

  5. Основной backend принимает этот список, дополняет его дополнительной информацией (например, названия отелей, фотографии, цены из БД) и отправляет полностью сформированный ответ обратно в браузер пользователя.

6.3. Управление артефактами

Для обеспечения надёжности, версионирования и масштабируемости мы разделили хранение метаданных моделии хранение крупных бинарных артефактов.
В качестве основы мы реализовали паттерн Model Registry, используя основную базу данных PostgreSQL.

Создана отдельная таблица ml_models, которая служит централизованным каталогом всех обученных моделей. Для каждой версии модели в таблице хранятся:

  • Метаданные: версия модели, время создания, метрики качества (AUC, LogLoss), оптимальные гиперпараметры.

  • Указатели на артефакты: вместо хранения самих файлов таблица содержит пути к весам модели (.pth), эмбеддингам (.npy) и другим сериализованным объектам (.gz).

Крупные артефакты сохраняются в выделенном высокопроизводительном Object Storage (например, Amazon S3, Google Cloud Storage). Такое раздельное хранение даёт несколько ключевых преимуществ:

Масштабируемость

API-сервис может быстро скачивать артефакты из объектного хранилища, не нагружая транзакционную базу данных.

Версионирование и контроль

Model Registry становится единственным источником правды, фиксируя полную историю экспериментов и продакшн-моделей.

Атомарные деплойменты

Промоут новой модели в продакшн сводится к атомарному обновлению флага is_active в таблице.Это делает обновление безопасным и легко обратимым.

При запуске ML-сервис:

  1. Делает запрос в реестр моделей

  2. Получает информацию об активной версии

  3. Скачивает артефакты из объектного хранилища

  4. Загружает их в память

7. Заключение

В данной работе мы представили DCN-R - гибридную нейросетевую архитектуру, эффективно решающую ключевую задачу баланса между запоминанием и обобщением.
Путём тщательной оптимизации гиперпараметров и проведения обширных абляционных экспериментов мы продемонстрировали, что модель достигает высоких результатов на валидации: (AUC: 0.9526, LogLoss: 0.1686).

Основным выводом исследования является то, что для рекомендационных задач с высоким уровнем сигнала и низким уровнем шума хорошо настроенный Cross Network выступает основным источником предсказательной мощности.
Кроме того, мы эмпирически показали, что выбор архитектуры глубокого компонента имеет критическое значение: Residual Network обеспечивает устойчивое и надёжное обобщение, тогда как использование стандартного MLP может снижать качество модели.

Комбинируя преимущества двух специализированных компонент - Cross Network и Residual Network - архитектура DCN-R формирует мощный и адаптируемый фундамент для построения высокопроизводительных recommendation-систем, готовых к применению в реальных продуктах.

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  • 05.07.26 14:44 lydiassmith567

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  • 06.07.26 16:20 Olga Ognjanović

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  • 06.07.26 16:31 Joseph Weigl

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  • 06.07.26 16:33 Jaran Løvlien

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  • 07.07.26 18:00 robertalfred175

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  • 07.07.26 18:01 robertalfred175

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  • 09.07.26 19:06 Toivo Walli

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  • 09.07.26 19:10 Misty Alexander

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  • 12.07.26 03:30 Kora Baltacha

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  • 13.07.26 23:49 [email protected]

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  • 15.07.26 11:53 Sarah Green

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  • 16.07.26 21:38 patricialovick86

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  • 16.07.26 21:38 patricialovick86

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  • 18.07.26 17:12 Malthe Larsen

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  • 18.07.26 23:51 bernalzenaida

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  • 19.07.26 04:10 Fraddy Pual

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  • 19.07.26 19:53 kimberlyhebertt6877

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  • 19.07.26 19:53 kimberlyhebertt6877

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  • 19.07.26 19:54 kimberlyhebertt6877

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  • 30.07.26 00:04 Ahmed

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  • 30.07.26 17:27 wendytaylor015

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  • 30.07.26 17:27 wendytaylor015

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  • 31.07.26 16:21 rssllhrnsb

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TEXT : (tatianasorina06 at G.Ma IL ..c 0 m ) Before committing money to any investment, take time to verify the legitimacy of the platform, confirm any relevant regulatory authorisations, and avoid investing more than you can comfortably afford to lose.

  • 01.08.26 15:05 keithwilson9899

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  • 01.08.26 15:05 keithwilson9899

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  • 03.08.26 20:05 Philip

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  • 03.08.26 20:06 Philip

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  • 04.08.26 11:05 Kisnoles

    Excellent analysis, thank you. I was particularly struck by how rigidly the skill sets the order: data processing and form come first, with color coming last. This really cures the habit of "first a pretty palette, then we'll figure it out." A palette validator using OKLCH + color blindness + WCAG is something most chart generators lack. And regarding the boundaries of competence, it's very clear. Where there's a self-checking loop (color), you delegate freely. Where there's a heuristic (form, data interpretation), you remain the final filter. This is a universal principle, not just for /dataviz. By the way, when you look at trading dashboards (including those of decent platforms like ExpertOption), it's immediately clear who thought about readability and who just threw in rainbow lines. Tools like this skill could greatly improve the quality of analytics. Thanks again for the detailed analysis – saved.

  • 04.08.26 12:37 kimberlyhebertt6877

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  • 16.08.26 01:44 Matt Kegan

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  • 18.08.26 04:59 marcushenderson624

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  • 19.08.26 14:50 BAYER7043

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  • 20.08.26 11:32 michaeldavenport218

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  • 23.08.26 20:02 leslieyee

    Excellent analysis by /dataviz! I was particularly struck by how strictly the order is defined: "data meaning first, color last" and how the validator actually adjusts the palette according to OKLCH, color blindness, and WCAG standards. These rules greatly improve the quality of charts. By the way, a similar approach to clean and legible charts is highly valued in trading—for example, on the ExpertOption platform, the interface and price visualization are designed to ensure information is read instantly and without unnecessary noise.

  • 25.08.26 13:44 lydiassmith567

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  • 30.08.26 15:37 [email protected]

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  • 01.09.26 17:34 Garry42

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  • 02.09.26 03:43 kimberlyhebertt6877

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  • 11.09.26 03:23 kimberlyhebertt6877

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  • 15.09.26 03:35 elioduncan

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    I Invested 45,000  Euro, and later aggreviated to 198,000 Euro.  I requested  to place Withdrawal of my funds to be paid to my Bank account. But nothing happened I was subjected to pay more fee until I can get my funds on my account, i got in touch with Theodore ryan here on this platform who had helped a lot of people, I followed all instructions and he legally got back my withheld funds, I got threatened by the company that if I don’t pay they will get my account frozen, all thanks to Theodore ryan and I highly recommend him to anyone dealing with an unregulated broker company… contact him on his Gmail - theodoreryan318@  gmail .  com

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    Professional Crypto Recovery Testimonial After losing a significant amount of cryptocurrency through a scam on Twitter, I was unsure whether my Bitcoin funds could ever be recovered. The experience was extremely stressful, particularly because I encountered several individuals and services claiming they could help recover my assets, only to discover that some were fraudulent themselves. A friend eventually referred me to CAPITAL CRYPTO RECOVER. Their team handled my case professionally, discreetly, and efficiently. With their assistance, I successfully recovered approximately $130,000 worth of USDT in just over a week. My experience taught me the importance of being extremely cautious when seeking cryptocurrency recovery services, as scammers often target victims a second time. I am grateful to CAPITAL CRYPTO RECOVER for the assistance I received and wanted to share my experience with others who may be facing a similar situation. If you’ve been compromised, don’t lose hope—and be careful of fraudsters posing as saviors. CAPITAL CRYPTO RECOVER are real professionals in crypto recovery. I am a living proof of their effectiveness, you can reach them through Phone (Call/WhatsApp): +1 (336) 390-6684 Email: [email protected] Alternate Email: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 06.10.26 06:13 melissathomason573

    Professional Crypto Recovery Testimonial After losing a significant amount of cryptocurrency through a scam on Twitter, I was unsure whether my Bitcoin funds could ever be recovered. The experience was extremely stressful, particularly because I encountered several individuals and services claiming they could help recover my assets, only to discover that some were fraudulent themselves. A friend eventually referred me to CAPITAL CRYPTO RECOVER. Their team handled my case professionally, discreetly, and efficiently. With their assistance, I successfully recovered approximately $130,000 worth of USDT in just over a week. My experience taught me the importance of being extremely cautious when seeking cryptocurrency recovery services, as scammers often target victims a second time. I am grateful to CAPITAL CRYPTO RECOVER for the assistance I received and wanted to share my experience with others who may be facing a similar situation. If you’ve been compromised, don’t lose hope—and be careful of fraudsters posing as saviors. CAPITAL CRYPTO RECOVER are real professionals in crypto recovery. I am a living proof of their effectiveness, you can reach them through Phone (Call/WhatsApp): +1 (336) 390-6684 Email: [email protected] Alternate Email: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 06.10.26 17:44 Darrell1717

    I fell victim of a scam I invested to total of 5thousand into. I know it could be risky but after I trusted this man I was dating online he lured me into investing with him. I know hard I worked of my money so I wanted every way possible to get it back. I really appreciate Blockrecoveryexpert for successfully recovered my funds form this scammer. This is all I can say. You can reachout if you ever need help contact blockrecoveryexpert (at) gmail (dot)com

  • 11.10.26 03:04 Patricia014

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  • 12.10.26 19:34 lydiassmith567

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  • 17.10.26 12:58 melissathomason573

    Professional Crypto Recovery Testimonial After losing a significant amount of cryptocurrency through a scam on Twitter, I was unsure whether my Bitcoin funds could ever be recovered. The experience was extremely stressful, particularly because I encountered several individuals and services claiming they could help recover my assets, only to discover that some were fraudulent themselves. A friend eventually referred me to CAPITAL CRYPTO RECOVER. Their team handled my case professionally, discreetly, and efficiently. With their assistance, I successfully recovered approximately $130,000 worth of USDT in just over a week. My experience taught me the importance of being extremely cautious when seeking cryptocurrency recovery services, as scammers often target victims a second time. I am grateful to CAPITAL CRYPTO RECOVER for the assistance I received and wanted to share my experience with others who may be facing a similar situation. If you’ve been compromised, don’t lose hope—and be careful of fraudsters posing as saviors. CAPITAL CRYPTO RECOVER are real professionals in crypto recovery. I am a living proof of their effectiveness, you can reach them through Phone (Call/WhatsApp): +1 (336) 390-6684 Email: [email protected] Alternate Email: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

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    Professional Crypto Recovery Testimonial After losing a significant amount of cryptocurrency through a scam on Twitter, I was unsure whether my Bitcoin funds could ever be recovered. The experience was extremely stressful, particularly because I encountered several individuals and services claiming they could help recover my assets, only to discover that some were fraudulent themselves. A friend eventually referred me to CAPITAL CRYPTO RECOVER. Their team handled my case professionally, discreetly, and efficiently. With their assistance, I successfully recovered approximately $130,000 worth of USDT in just over a week. My experience taught me the importance of being extremely cautious when seeking cryptocurrency recovery services, as scammers often target victims a second time. I am grateful to CAPITAL CRYPTO RECOVER for the assistance I received and wanted to share my experience with others who may be facing a similar situation. If you’ve been compromised, don’t lose hope—and be careful of fraudsters posing as saviors. CAPITAL CRYPTO RECOVER are real professionals in crypto recovery. I am a living proof of their effectiveness, you can reach them through Phone (Call/WhatsApp): +1 (336) 390-6684 Email: [email protected] Alternate Email: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

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    Cyberspacetechexpert focuses on recovering stolen cryptocurrency, particularly USDT and bitcoin. She is well-known for helping victims of digital asset theft. Her reputation arises from successful recoveries that have allowed many to regain their lost funds. I witnessed this when $74,000 was taken from me in January. Thanks to the best female hacker Gracias, I recovered the entire amount in just 14 hours. Her prompt response and effective methods relieved my financial burden. Her commitment to helping others is evident. She is always available to offer solutions to those facing similar problems. For assistance, she can be reached via email Cyberspacetechexpert@gmail .com. or speak to her on What App at + 44 7476618364.

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