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Merged
awf merged 4 commits into from
Aug 22, 2025
Merged

Release v0.5 #53

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43fbcec
reorder fields for better docs
awf Aug 21, 2025
4a5b043
Add Signedness enum. Bump version
awf Aug 21, 2025
6061f36
doc fixes, remove unused function
awf Aug 21, 2025
742de2f
import Signedness
awf Aug 22, 2025
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12 changes: 11 additions & 1 deletion ChangeLog
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Original file line number Diff line number Diff line change
@@ -1,11 +1,21 @@

0.5: August 21, 2025
- Use array-api for cross-framework compatibility
- Fix rounding issue for large bfloat16s by @blissb-positron in #49
- Replaced microxscaling with torchao
- Update IEEE P3109 implementation to Interim Report v3

0.4: Nov 13, 2024
- Add stochastic rounding
- Add vectorized versions of round/encode/decode for near-JAX speed
- Update IEEE P3109 implementation to Interim report v2

0.3: Jun 10, 2024
- Use python ints throughout, adding float64 to test
- Simplify round, fix directed rounding
- Rename "ival" to "code" in FloatValue
- Shorten format names from "format_info_*" to "*"


0.2: May 21, 2024
- Add MX Formats
- Improved CI
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45 changes: 28 additions & 17 deletions README.md
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Expand Up @@ -19,24 +19,35 @@ See https://gfloat.readthedocs.io for documentation, or dive into the notebooks

For example, here's a table from the [02-value-stats](docs/source/02-value-stats.ipynb) notebook:

|name|B: Bits in the format|P: Precision in bits|E: Exponent field width in bits|0<x<1|1<x<Inf|Exact in float16?|maxFinite|minFinite|maxNormal|minNormal|minSubnormal|maxSubnormal|
|name|B: Bits in the format|P: Precision in bits|E: Exponent field width in bits|Exact in float16?|Exact in float32?|0<x<1|1<x<Inf|minSubnormal|maxSubnormal|minNormal|maxNormal| |
|--- |--- |--- |--- |--- |--- |--- |--- |--- |--- |--- |--- |--- |
|ocp_e2m1|4|2|2|1|5|True|6|-6|6|1|0.5|0.5|
|ocp_e2m3|6|4|2|7|23|True|7.5|-7.5|7.5|1|0.125|0.875|
|ocp_e3m2|6|3|3|11|19|True|28|-28|28|0.25|0.0625|0.1875|
|ocp_e4m3|8|4|4|55|70|True|448|-448|448|0.015625|1*2^-9|7/4*2^-7|
|ocp_e5m2|8|3|5|59|63|True|57344|-57344|57344|1*2^-14|1*2^-16|3/2*2^-15|
|p3109_8p1|8|1|7|62|63|False|1*2^63|-1*2^63|1*2^63|1*2^-62|nan|nan|
|p3109_8p2|8|2|6|63|62|False|1*2^31|-1*2^31|1*2^31|1*2^-31|1*2^-32|1*2^-32|
|p3109_8p3|8|3|5|63|62|True|49152|-49152|49152|1*2^-15|1*2^-17|3/2*2^-16|
|p3109_8p4|8|4|4|63|62|True|224|-224|224|0.0078125|1*2^-10|7/4*2^-8|
|p3109_8p5|8|5|3|63|62|True|15|-15|15|0.125|0.0078125|15/8*2^-4|
|p3109_8p6|8|6|2|63|62|True|3.875|-3.875|3.875|0.5|0.015625|31/16*2^-2|
|bfloat16|16|8|8|16255|16383|False|255/128*2^127|-255/128*2^127|255/128*2^127|1*2^-126|1*2^-133|127/64*2^-127|
|ocp_int8|8|8|0|63|63|True|127/64*2^0|-2|nan|nan|0.015625|127/64*2^0|
|ocp_e8m0|8|1|8|127|127|False|1*2^127|1*2^-127|1*2^127|1*2^-127|nan|nan|


| name | B | P | E | rt16 | rt32 | lt1 | gt1 | minSubnormal | maxSubnormal | minNormal | maxNormal |
|--------------|-----|-----|-----|--------|--------|-------|-------|----------------|----------------|-------------|---------------|
| p3109_k3p2sf | 3 | 2 | 1 | True | True | 1 | 1 | 0.5 | 0.5 | 1 | 1.5 |
| ocp_e2m1 | 4 | 2 | 2 | True | True | 1 | 5 | 0.5 | 0.5 | 1 | 6 |
| p3109_k4p2sf | 4 | 2 | 2 | True | True | 3 | 3 | 0.25 | 0.25 | 0.5 | 3 |
| ocp_e2m3 | 6 | 4 | 2 | True | True | 7 | 23 | 0.125 | 0.875 | 1 | 7.5 |
| ocp_e3m2 | 6 | 3 | 3 | True | True | 11 | 19 | 0.0625 | 0.1875 | 0.25 | 28 |
| p3109_k6p3sf | 6 | 3 | 3 | True | True | 15 | 15 | 0.03125 | 0.09375 | 0.125 | 14 |
| p3109_k6p4sf | 6 | 4 | 2 | True | True | 15 | 15 | 0.0625 | 0.4375 | 0.5 | 3.75 |
| ocp_e4m3 | 8 | 4 | 4 | True | True | 55 | 70 | 2^-9 | 7/4*2^-7 | 0.015625 | 448 |
| ocp_e5m2 | 8 | 3 | 5 | True | True | 59 | 63 | 2^-16 | 3/2*2^-15 | 2^-14 | 57344 |
| p3109_k8p1se | 8 | 1 | 7 | False | True | 63 | 62 | n/a | n/a | 2^-63 | 2^62 |
| p3109_k8p1ue | 8 | 1 | 8 | False | True | 127 | 125 | n/a | n/a | 2^-127 | 2^125 |
| p3109_k8p3se | 8 | 3 | 5 | True | True | 63 | 62 | 2^-17 | 3/2*2^-16 | 2^-15 | 49152 |
| p3109_k8p3sf | 8 | 3 | 5 | True | True | 63 | 63 | 2^-17 | 3/2*2^-16 | 2^-15 | 57344 |
| p3109_k8p3ue | 8 | 3 | 6 | False | True | 127 | 125 | 2^-33 | 3/2*2^-32 | 2^-31 | 5/4*2^31 |
| p3109_k8p3uf | 8 | 3 | 6 | False | True | 127 | 126 | 2^-33 | 3/2*2^-32 | 2^-31 | 3/2*2^31 |
| p3109_k8p4se | 8 | 4 | 4 | True | True | 63 | 62 | 2^-10 | 7/4*2^-8 | 0.0078125 | 224 |
| p3109_k8p4sf | 8 | 4 | 4 | True | True | 63 | 63 | 2^-10 | 7/4*2^-8 | 0.0078125 | 240 |
| p3109_k8p4ue | 8 | 4 | 5 | True | True | 127 | 125 | 2^-18 | 7/4*2^-16 | 2^-15 | 53248 |
| p3109_k8p4uf | 8 | 4 | 5 | True | True | 127 | 126 | 2^-18 | 7/4*2^-16 | 2^-15 | 57344 |
| p3109_k8p7sf | 8 | 7 | 1 | True | True | 63 | 63 | 0.015625 | 63/32*2^-1 | 1 | 127/64*2^0 |
| p3109_k8p8uf | 8 | 8 | 1 | True | True | 127 | 126 | 0.0078125 | 127/64*2^-1 | 1 | 127/64*2^0 |
| binary16 | 16 | 11 | 5 | True | True | 15359 | 16383 | 2^-24 | 1023/512*2^-15 | 2^-14 | 65504 |
| bfloat16 | 16 | 8 | 8 | False | True | 16255 | 16383 | 2^-133 | 127/64*2^-127 | 2^-126 | 255/128*2^127 |
| ocp_e8m0 | 8 | 1 | 8 | False | True | 127 | 127 | n/a | n/a | 2^-127 | 2^127 |
| ocp_int8 | 8 | 8 | 0 | True | True | 63 | 63 | 0.015625 | 127/64*2^0 | n/a | n/a |
#### Notes

All NaNs are the same, with no distinction between signalling or quiet,
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10 changes: 5 additions & 5 deletions docs/source/01-decode.ipynb
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