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ml_dtypes

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ml_dtypes is a stand-alone implementation of several NumPy dtype extensions used in machine learning libraries, including:

  • bfloat16: an alternative to the standard float16 format
  • 8-bit floating point representations, parameterized by number of exponent and mantissa bits, as well as the bias (if any) and representability of infinity, NaN, and signed zero.
    • float8_e3m4
    • float8_e4m3
    • float8_e4m3b11fnuz
    • float8_e4m3fn
    • float8_e4m3fnuz
    • float8_e5m2
    • float8_e5m2fnuz
    • float8_e8m0fnu
  • Microscaling (MX) sub-byte floating point representations:
    • float4_e2m1fn
    • float6_e2m3fn
    • float6_e3m2fn
  • Narrow integer encodings:
    • int1
    • int2
    • int4
    • uint1
    • uint2
    • uint4

See below for specifications of these number formats.

Installation

The ml_dtypes package is tested with Python versions 3.9-3.12, and can be installed with the following command:

pip install ml_dtypes

To test your installation, you can run the following:

pip install absl-py pytest
pytest --pyargs ml_dtypes

To build from source, clone the repository and run:

git submodule init
git submodule update
pip install .

Example Usage

>>> from ml_dtypes import bfloat16
>>> import numpy as np
>>> np.zeros(4, dtype=bfloat16)
array([0, 0, 0, 0], dtype=bfloat16)

Importing ml_dtypes also registers the data types with numpy, so that they may be referred to by their string name:

>>> np.dtype('bfloat16')
dtype(bfloat16)
>>> np.dtype('float8_e5m2')
dtype(float8_e5m2)

Specifications of implemented floating point formats

bfloat16

A bfloat16 number is a single-precision float truncated at 16 bits.

Exponent: 8, Mantissa: 7, exponent bias: 127. IEEE 754, with NaN and inf.

float4_e2m1fn

Exponent: 2, Mantissa: 1, bias: 1.

Extended range: no inf, no NaN.

Microscaling format, 4 bits (encoding: 0bSEEM) using byte storage (higher 4 bits are unused). NaN representation is undefined.

Possible absolute values: [0, 0.5, 1, 1.5, 2, 3, 4, 6]

float6_e2m3fn

Exponent: 2, Mantissa: 3, bias: 1.

Extended range: no inf, no NaN.

Microscaling format, 6 bits (encoding: 0bSEEMMM) using byte storage (higher 2 bits are unused). NaN representation is undefined.

Possible values range: [-7.5; 7.5]

float6_e3m2fn

Exponent: 3, Mantissa: 2, bias: 3.

Extended range: no inf, no NaN.

Microscaling format, 4 bits (encoding: 0bSEEEMM) using byte storage (higher 2 bits are unused). NaN representation is undefined.

Possible values range: [-28; 28]

float8_e3m4

Exponent: 3, Mantissa: 4, bias: 3. IEEE 754, with NaN and inf.

float8_e4m3

Exponent: 4, Mantissa: 3, bias: 7. IEEE 754, with NaN and inf.

float8_e4m3b11fnuz

Exponent: 4, Mantissa: 3, bias: 11.

Extended range: no inf, NaN represented by 0b1000'0000.

float8_e4m3fn

Exponent: 4, Mantissa: 3, bias: 7.

Extended range: no inf, NaN represented by 0bS111'1111.

The fn suffix is for consistency with the corresponding LLVM/MLIR type, signaling this type is not consistent with IEEE-754. The f indicates it is finite values only. The n indicates it includes NaNs, but only at the outer range.

float8_e4m3fnuz

8-bit floating point with 3 bit mantissa.

An 8-bit floating point type with 1 sign bit, 4 bits exponent and 3 bits mantissa. The suffix fnuz is consistent with LLVM/MLIR naming and is derived from the differences to IEEE floating point conventions. F is for "finite" (no infinities), N for with special NaN encoding, UZ for unsigned zero.

This type has the following characteristics:

  • bit encoding: S1E4M3 - 0bSEEEEMMM
  • exponent bias: 8
  • infinities: Not supported
  • NaNs: Supported with sign bit set to 1, exponent bits and mantissa bits set to all 0s - 0b10000000
  • denormals when exponent is 0

float8_e5m2

Exponent: 5, Mantissa: 2, bias: 15. IEEE 754, with NaN and inf.

float8_e5m2fnuz

8-bit floating point with 2 bit mantissa.

An 8-bit floating point type with 1 sign bit, 5 bits exponent and 2 bits mantissa. The suffix fnuz is consistent with LLVM/MLIR naming and is derived from the differences to IEEE floating point conventions. F is for "finite" (no infinities), N for with special NaN encoding, UZ for unsigned zero.

This type has the following characteristics:

  • bit encoding: S1E5M2 - 0bSEEEEEMM
  • exponent bias: 16
  • infinities: Not supported
  • NaNs: Supported with sign bit set to 1, exponent bits and mantissa bits set to all 0s - 0b10000000
  • denormals when exponent is 0

float8_e8m0fnu

OpenCompute MX scale format E8M0, which has the following properties:

  • Unsigned format
  • 8 exponent bits
  • Exponent range from -127 to 127
  • No zero and infinity
  • Single NaN value (0xFF).

int1, uint1, int2, int4, uint2 and uint4

1, 2 and 4-bit integer types, where each element is represented unpacked (i.e., padded up to a byte in memory).

NumPy does not support types smaller than a single byte: for example, the distance between adjacent elements in an array (.strides) is expressed as an integer number of bytes. Relaxing this restriction would be a considerable engineering project. These types therefore use an unpacked representation, where each element of the array is padded up to a byte in memory. The lower two or four bits of each byte contain the representation of the number, whereas the remaining upper bits are ignored.

Quirks of low-precision Arithmetic

If you're exploring the use of low-precision dtypes in your code, you should be careful to anticipate when the precision loss might lead to surprising results. One example is the behavior of aggregations like sum; consider this bfloat16 summation in NumPy (run with version 1.24.2):

>>> from ml_dtypes import bfloat16
>>> import numpy as np
>>> rng = np.random.default_rng(seed=0)
>>> vals = rng.uniform(size=10000).astype(bfloat16)
>>> vals.sum()
256

The true sum should be close to 5000, but numpy returns exactly 256: this is because bfloat16 does not have the precision to increment 256 by values less than 1:

>>> bfloat16(256) + bfloat16(1)
256

After 256, the next representable value in bfloat16 is 258:

>>> np.nextafter(bfloat16(256), bfloat16(np.inf))
258

For better results you can specify that the accumulation should happen in a higher-precision type like float32:

>>> vals.sum(dtype='float32').astype(bfloat16)
4992

In contrast to NumPy, projects like JAX which support low-precision arithmetic more natively will often do these kinds of higher-precision accumulations automatically:

>>> import jax.numpy as jnp
>>> jnp.array(vals).sum()
Array(4992, dtype=bfloat16)

License

This is not an officially supported Google product.

The ml_dtypes source code is licensed under the Apache 2.0 license (see LICENSE). Pre-compiled wheels are built with the EIGEN project, which is released under the MPL 2.0 license (see LICENSE.eigen).

Release files for ml-dtypes 0.6.0

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Source distribution (sdist)

Source distribution for ml-dtypes 0.6.0
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Built distributions (wheels)

Table of built distributions (wheels) for ml-dtypes 0.6.0
File
ml_dtypes-0.6.0-cp315-cp315t-win_arm64.whl CPython 3.15 CPython 3.15 free-threading Windows ARM64 Details
ml_dtypes-0.6.0-cp315-cp315t-win_amd64.whl CPython 3.15 CPython 3.15 free-threading Windows x86-64 Details
ml_dtypes-0.6.0-cp315-cp315t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 Details
ml_dtypes-0.6.0-cp315-cp315t-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.15 CPython 3.15 free-threading Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64 Details
ml_dtypes-0.6.0-cp315-cp315t-macosx_10_15_universal2.whl CPython 3.15 CPython 3.15 free-threading macOS 10.15+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp315-cp315-win_arm64.whl CPython 3.15 CPython 3.15 Windows ARM64 Details
ml_dtypes-0.6.0-cp315-cp315-win_amd64.whl CPython 3.15 CPython 3.15 Windows x86-64 Details
ml_dtypes-0.6.0-cp315-cp315-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.15 CPython 3.15 Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 Details
ml_dtypes-0.6.0-cp315-cp315-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.15 CPython 3.15 Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64 Details
ml_dtypes-0.6.0-cp315-cp315-macosx_10_15_universal2.whl CPython 3.15 CPython 3.15 macOS 10.15+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp314-cp314t-win_arm64.whl CPython 3.14 CPython 3.14 free-threading Windows ARM64 Details
ml_dtypes-0.6.0-cp314-cp314t-win_amd64.whl CPython 3.14 CPython 3.14 free-threading Windows x86-64 Details
ml_dtypes-0.6.0-cp314-cp314t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 Details
ml_dtypes-0.6.0-cp314-cp314t-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 free-threading Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64 Details
ml_dtypes-0.6.0-cp314-cp314t-macosx_10_15_universal2.whl CPython 3.14 CPython 3.14 free-threading macOS 10.15+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp314-cp314-win_arm64.whl CPython 3.14 CPython 3.14 Windows ARM64 Details
ml_dtypes-0.6.0-cp314-cp314-win_amd64.whl CPython 3.14 CPython 3.14 Windows x86-64 Details
ml_dtypes-0.6.0-cp314-cp314-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 Details
ml_dtypes-0.6.0-cp314-cp314-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64 Details
ml_dtypes-0.6.0-cp314-cp314-macosx_10_15_universal2.whl CPython 3.14 CPython 3.14 macOS 10.15+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp313-cp313-win_arm64.whl CPython 3.13 CPython 3.13 Windows ARM64 Details
ml_dtypes-0.6.0-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details
ml_dtypes-0.6.0-cp313-cp313-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.13 CPython 3.13 Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 Details
ml_dtypes-0.6.0-cp313-cp313-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64 Details
ml_dtypes-0.6.0-cp313-cp313-macosx_10_13_universal2.whl CPython 3.13 CPython 3.13 macOS 10.13+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp312-cp312-win_arm64.whl CPython 3.12 CPython 3.12 Windows ARM64 Details
ml_dtypes-0.6.0-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details
ml_dtypes-0.6.0-cp312-cp312-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 Details
ml_dtypes-0.6.0-cp312-cp312-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64 Details
ml_dtypes-0.6.0-cp312-cp312-macosx_10_13_universal2.whl CPython 3.12 CPython 3.12 macOS 10.13+ universal2 (ARM64, x86-64) Details
ml_dtypes-0.6.0-cp311-cp311-win_arm64.whl CPython 3.11 CPython 3.11 Windows ARM64 Details
ml_dtypes-0.6.0-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details
ml_dtypes-0.6.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64 Details
ml_dtypes-0.6.0-cp311-cp311-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.27+ ARM64, Linux glibc 2.28+ ARM64 Details
ml_dtypes-0.6.0-cp311-cp311-macosx_10_9_universal2.whl CPython 3.11 CPython 3.11 macOS 10.9+ universal2 (ARM64, x86-64) Details
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ml_dtypes-0.6.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 Details
ml_dtypes-0.6.0-cp310-cp310-manylinux_2_27_aarch64.manylinux_2_28_aarch64.whl CPython 3.10 CPython 3.10 Linux glibc 2.28+ ARM64, Linux glibc 2.27+ ARM64 Details
ml_dtypes-0.6.0-cp310-cp310-macosx_10_9_universal2.whl CPython 3.10 CPython 3.10 macOS 10.9+ universal2 (ARM64, x86-64) Details

Total release size: 21.3 MB

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