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Efficient matrix representations for working with tabular data

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Installation

Simply install via conda-forge!

conda install -c conda-forge tabmat

Getting Started

The easiest way to start with tabmat is to use the convenience constructor tabmat.from_pandas.

import tabmat as tm
import numpy as np

dense_array = np.random.normal(size=(100, 1))

Use case

TL;DR: We provide matrix classes for efficiently building statistical algorithms with data that is partially dense, partially sparse and partially categorical.

Data used in economics, actuarial science, and many other fields is often tabular, containing rows and columns. Further common properties are also common:

  • It often is very sparse.
  • It often contains a mix of dense and sparse columns.
  • It often contains categorical data, processed into many columns of indicator values created by "one-hot encoding."

High-performance statistical applications often require fast computation of certain operations, such as

  • Computing sandwich products of the data, transpose(X) @ diag(d) @ X. A sandwich product shows up in the solution to weighted least squares, as well as in the Hessian of the likelihood in generalized linear models such as Poisson regression.
  • Matrix-vector products, possibly on only a subset of the rows or columns. For example, when limiting computation to an "active set" in a L1-penalized coordinate descent implementation, we may only need to compute a matrix-vector product on a small subset of the columns.
  • Computing all operations on standardized predictors which have mean zero and standard deviation one. This helps with numerical stability and optimizer efficiency in a wide range of machine learning algorithms.

This library and its design

We designed this library with the above use cases in mind. We built this library first for estimating generalized linear models, but expect it will be useful in a variety of econometric and statistical use cases. This library was borne out of our need for speed, and its unified API is motivated by the desire to work with a unified matrix API internal to our statistical algorithms.

Design principles:

  • Speed and memory efficiency are paramount.
  • You don't need to sacrifice functionality by using this library: DenseMatrix and SparseMatrix subclass np.ndarray and scipy.sparse.csc_matrix respectively, and inherit behavior from those classes wherever it is not improved on.
  • As much as possible, syntax follows NumPy syntax, and dimension-reducing operations (like sum) return NumPy arrays, following NumPy dimensions about the dimensions of results. The aim is to make these classes as close as possible to being drop-in replacements for numpy.ndarray. This is not always possible, however, due to the differing APIs of numpy.ndarray and scipy.sparse.
  • Other operations, such as toarray, mimic Scipy sparse syntax.
  • All matrix classes support matrix-vector products, sandwich products, and getcol.

Individual subclasses may support significantly more operations.

Matrix types

  • DenseMatrix represents dense matrices, subclassing numpy nparray. It additionally supports methods getcol, toarray, sandwich, standardize, and unstandardize.
  • SparseMatrix represents column-major sparse data, subclassing scipy.sparse.csc_matrix. It additionally supports methods sandwich and standardize.
  • CategoricalMatrix represents one-hot encoded categorical matrices. Because all the non-zeros in these matrices are ones and because each row has only one non-zero, the data can be represented and multiplied much more efficiently than a generic sparse matrix.
  • SplitMatrix represents matrices with both dense, sparse and categorical parts, allowing for a significant speedup in matrix multiplications.
  • StandardizedMatrix efficiently and sparsely represents a matrix that has had its column normalized to have mean zero and variance one. Even if the underlying matrix is sparse, such a normalized matrix will be dense. However, by storing the scaling and shifting factors separately, StandardizedMatrix retains the original matrix sparsity.

Wide data set

Benchmarks

See here for detailed benchmarking.

API documentation

See here for detailed API documentation.

Metadata

Release files for tabmat 4.3.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for tabmat 4.3.0
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tabmat-4.3.0.tar.gz 2.4 MB With provenance Details for tabmat-4.3.0.tar.gz

Built distributions (wheels)

Table of built distributions (wheels) for tabmat 4.3.0
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tabmat-4.3.0-cp315-cp315t-win_amd64.whl CPython 3.15 CPython 3.15 free-threading Windows x86-64 Details for tabmat-4.3.0-cp315-cp315t-win_amd64.whl
tabmat-4.3.0-cp315-cp315t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details for tabmat-4.3.0-cp315-cp315t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp315-cp315t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp315-cp315t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp315-cp315t-macosx_12_0_x86_64.whl CPython 3.15 CPython 3.15 free-threading macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp315-cp315t-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp315-cp315t-macosx_12_0_arm64.whl CPython 3.15 CPython 3.15 free-threading macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp315-cp315t-macosx_12_0_arm64.whl
tabmat-4.3.0-cp315-cp315-win_amd64.whl CPython 3.15 CPython 3.15 Windows x86-64 Details for tabmat-4.3.0-cp315-cp315-win_amd64.whl
tabmat-4.3.0-cp315-cp315-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.15 CPython 3.15 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details for tabmat-4.3.0-cp315-cp315-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp315-cp315-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.15 CPython 3.15 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp315-cp315-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp315-cp315-macosx_12_0_x86_64.whl CPython 3.15 CPython 3.15 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp315-cp315-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp315-cp315-macosx_12_0_arm64.whl CPython 3.15 CPython 3.15 macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp315-cp315-macosx_12_0_arm64.whl
tabmat-4.3.0-cp314-cp314t-win_amd64.whl CPython 3.14 CPython 3.14 free-threading Windows x86-64 Details for tabmat-4.3.0-cp314-cp314t-win_amd64.whl
tabmat-4.3.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64 Details for tabmat-4.3.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp314-cp314t-macosx_12_0_x86_64.whl CPython 3.14 CPython 3.14 free-threading macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp314-cp314t-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp314-cp314t-macosx_12_0_arm64.whl CPython 3.14 CPython 3.14 free-threading macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp314-cp314t-macosx_12_0_arm64.whl
tabmat-4.3.0-cp314-cp314-win_amd64.whl CPython 3.14 CPython 3.14 Windows x86-64 Details for tabmat-4.3.0-cp314-cp314-win_amd64.whl
tabmat-4.3.0-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details for tabmat-4.3.0-cp314-cp314-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp314-cp314-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp314-cp314-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp314-cp314-macosx_12_0_x86_64.whl CPython 3.14 CPython 3.14 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp314-cp314-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp314-cp314-macosx_12_0_arm64.whl CPython 3.14 CPython 3.14 macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp314-cp314-macosx_12_0_arm64.whl
tabmat-4.3.0-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details for tabmat-4.3.0-cp313-cp313-win_amd64.whl
tabmat-4.3.0-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64 Details for tabmat-4.3.0-cp313-cp313-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp313-cp313-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp313-cp313-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp313-cp313-macosx_12_0_x86_64.whl CPython 3.13 CPython 3.13 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp313-cp313-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp313-cp313-macosx_12_0_arm64.whl CPython 3.13 CPython 3.13 macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp313-cp313-macosx_12_0_arm64.whl
tabmat-4.3.0-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details for tabmat-4.3.0-cp312-cp312-win_amd64.whl
tabmat-4.3.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.24+ x86-64, Linux glibc 2.28+ x86-64 Details for tabmat-4.3.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp312-cp312-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp312-cp312-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp312-cp312-macosx_12_0_x86_64.whl CPython 3.12 CPython 3.12 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp312-cp312-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp312-cp312-macosx_12_0_arm64.whl CPython 3.12 CPython 3.12 macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp312-cp312-macosx_12_0_arm64.whl
tabmat-4.3.0-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details for tabmat-4.3.0-cp311-cp311-win_amd64.whl
tabmat-4.3.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details for tabmat-4.3.0-cp311-cp311-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp311-cp311-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp311-cp311-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp311-cp311-macosx_12_0_x86_64.whl CPython 3.11 CPython 3.11 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp311-cp311-macosx_12_0_x86_64.whl
tabmat-4.3.0-cp311-cp311-macosx_12_0_arm64.whl CPython 3.11 CPython 3.11 macOS 12.0+ ARM64 Details for tabmat-4.3.0-cp311-cp311-macosx_12_0_arm64.whl
tabmat-4.3.0-cp310-cp310-win_amd64.whl CPython 3.10 CPython 3.10 Windows x86-64 Details for tabmat-4.3.0-cp310-cp310-win_amd64.whl
tabmat-4.3.0-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64 Details for tabmat-4.3.0-cp310-cp310-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
tabmat-4.3.0-cp310-cp310-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl CPython 3.10 CPython 3.10 Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64 Details for tabmat-4.3.0-cp310-cp310-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
tabmat-4.3.0-cp310-cp310-macosx_12_0_x86_64.whl CPython 3.10 CPython 3.10 macOS 12.0+ x86-64 Details for tabmat-4.3.0-cp310-cp310-macosx_12_0_x86_64.whl
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