Efficient Compression and Retrieval of Tabular Data using Deep Learning-based Mapping

Alapfogalmak

A novel DeepMapping abstraction that leverages deep neural networks to integrate compression and indexing capabilities for efficient storage and retrieval of tabular data.

Kivonat

The paper proposes a novel data abstraction called DeepMapping that leverages deep neural networks to balance storage cost, query latency, and runtime memory footprint for tabular data. The key ideas are:

Hybrid Data Representation: DeepMapping couples a compact, multi-task neural network model with a lightweight auxiliary data structure to achieve 100% accuracy without requiring a prohibitively large model.

Multi-Task Hybrid Architecture Search (MHAS): MHAS is a neural architecture search algorithm that adaptively tunes the number of shared and private layers and the sizes of the layers to optimize the overall size of the hybrid architecture.

Modification Workflows: DeepMapping supports efficient insert, delete, and update operations by materializing the modifications in the auxiliary structure and triggering model retraining only when the auxiliary structure exceeds a threshold.

Extensive experiments on TPC-H, TPC-DS, synthetic, and real-world datasets demonstrate that DeepMapping can better balance storage, retrieval speed, and runtime memory footprint compared to state-of-the-art compression and indexing techniques, especially in memory-constrained environments.

Statisztikák

The paper provides the following key statistics:

DeepMapping can achieve up to 15x speedup over baselines in memory-constrained environments by alleviating I/O and decompression costs.
DeepMapping can reduce the storage size by up to 43x compared to the second-best baseline.

Idézetek

"DeepMapping leverages the impressive memorization capabilities of deep neural networks to provide better storage cost, better latency, and better run-time memory footprint, all at the same time."
"The auxiliary structure design further enables DeepMapping to efficiently deal with insertions, deletions, and updates even without retraining the mapping."

Főbb Kivonatok

DeepMapping: Learned Data Mapping for Lossless Compression and Efficient Lookup

by Lixi... : arxiv.org 09-27-2024

https://arxiv.org/pdf/2307.05861.pdf

Mélyebb kérdések

How can DeepMapping be extended to support range queries and other types of queries beyond exact-match lookups?

DeepMapping can be extended to support range queries through two primary approaches: batch inference and view-based materialization.

Batch Inference Approach: This method involves applying range-based filtering on the existence index to collect all keys that fall within the specified range. Once the relevant keys are identified, batch inference is performed on these keys to retrieve the corresponding values. This approach leverages the efficiency of neural network inference while ensuring that the results are accurate and relevant to the specified range.

View-Based Materialization: In this approach, the results of sampled range queries are materialized into a view that includes multiple columns, such as range boundaries and query results. A DeepMapping structure is then learned on top of this materialized view, using the range boundaries as the key. At runtime, when a range query is issued, the system can quickly look up the results in the learned DeepMapping structure, providing a fast and efficient way to handle range queries.

Additionally, to support other types of queries, such as aggregation or complex joins, DeepMapping could be adapted to learn multi-dimensional mappings or to incorporate additional auxiliary structures that can handle the complexities of these queries. This would involve extending the neural network architecture to accommodate the increased dimensionality and relationships between different data attributes.

What are the potential limitations of the DeepMapping approach, and how can it be further improved to handle more diverse data types and workloads?

While DeepMapping presents significant advantages in compressing and indexing tabular data, it does have potential limitations:

Accuracy Challenges: The reliance on neural networks for memorization can lead to inaccuracies, especially with categorical data where lossless compression is required. Misclassifications can occur, and while the auxiliary structure mitigates this, it may not be sufficient for all datasets.

Model Complexity: The architecture search process for optimizing the neural network can be computationally intensive and may not scale well with larger datasets or more complex data types. This could lead to increased latency during the model training phase.

Data Diversity: DeepMapping is primarily designed for tabular data. Handling more diverse data types, such as unstructured data (e.g., text, images) or semi-structured data (e.g., JSON), may require significant modifications to the architecture and training processes.

To improve DeepMapping's capabilities, the following strategies could be employed:

Enhanced Model Training: Implementing advanced training techniques, such as transfer learning or meta-learning, could help the model generalize better across different datasets and reduce the need for extensive retraining.

Multi-Modal Support: Extending the architecture to support multi-modal data inputs could allow DeepMapping to handle various data types more effectively. This could involve integrating different neural network architectures tailored for specific data types (e.g., CNNs for images, RNNs for sequences).

Dynamic Architecture Adaptation: Developing mechanisms for dynamic architecture adaptation could allow DeepMapping to adjust its structure based on the incoming data characteristics, improving its performance across diverse workloads.

Given the success of DeepMapping in compressing and indexing tabular data, how can similar deep learning-based techniques be applied to other data structures, such as graphs or time series, to achieve efficient storage and retrieval?

Deep learning-based techniques similar to those used in DeepMapping can be effectively applied to other data structures, such as graphs and time series, to enhance storage and retrieval efficiency:

Graph Data Structures: For graph data, deep learning techniques can be utilized to learn embeddings for nodes and edges, capturing the structural and relational information inherent in the graph. Techniques such as Graph Neural Networks (GNNs) can be employed to create compact representations of the graph, allowing for efficient storage. These embeddings can then be indexed using a learned mapping approach similar to DeepMapping, enabling fast retrieval of node and edge attributes based on their embeddings.

Time Series Data: In the context of time series data, recurrent neural networks (RNNs) or Long Short-Term Memory (LSTM) networks can be leveraged to learn patterns and dependencies over time. By training these models to predict future values based on historical data, a compressed representation of the time series can be created. This representation can be indexed for efficient querying, allowing for rapid access to historical data and predictions without the need for extensive decompression.

Hybrid Approaches: Combining techniques from both graph and time series domains can lead to innovative solutions for complex datasets that exhibit both temporal and relational characteristics. For instance, a hybrid model could learn to represent time-varying graphs, where the relationships between nodes change over time, allowing for efficient storage and retrieval of dynamic data.

By adapting the principles of DeepMapping to these diverse data structures, researchers and practitioners can achieve significant improvements in both storage efficiency and query performance, ultimately enhancing the capabilities of data management systems across various applications.