ENH: Named ellipsis in einsum
Open
Nobody has claimed this yet.
01 - Enhancement
- Dominant language
- Python
- Stars
- 32.8k
- Forks
- 12.8k
- Avg merge
- 1d 7h
- Merged PRs (30d)
- 197
Description
Proposed new feature or change:
Proposed new feature or change:
In the subsripts of einsum, allow ellipsis replaced by a named star notation like '(*i)', which can be explicitly referenced and expanded after '->'.
Example
import numpy as np
a = np.zeros((2, 3, 4))
assert np.einsum('(*i)k,(*j)k->(*i)(*j)', a, a).shape == (2, 3, 2, 3)
assert np.einsum('(*i)k,(*i)k->(*i)', a, a).shape == (2, 3)
Alternative
Omit parentheses
import numpy as np
a = np.zeros((2, 3))
assert np.einsum('*ik,*jk->*i*j', a, a).shape == (2, 3, 2, 3)
assert np.einsum('*ik,*ik->*i', a, a).shape == (2, 3)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at the numpy.einsum entry point and run the two proposed examples to compare the named-star and alternative syntaxes. Done means the requested ellipsis notation can be explicitly referenced and expanded after ->, producing the example output shapes.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- numpy, python
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100