scalanlp/breeze

Lazy Matrix/Vector implementations

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#310 opened on Sep 5, 2014

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 (1 comment) (0 reactions) (0 assignees)Scala (3,453 stars) (690 forks)batch import
enhancementhelp wantedproject

Description

This may stem from my lack of knowledge on how breeze works. I was wondering if you have support for lazy operations that only happen when needed.

Something like val a = Matrix.rand(3,3) val b = Matrix.rand(3,3)

val c = a + b where c is a LazyMatrix represented by a, b and the operation +

Contributor guide

Tech stack
scala
Domain
performance
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
ScalaBreeze libraryLazy evaluation patternsMatrix operations
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate Breeze's current matrix and vector implementations in the breeze.linalg package to understand how operations are currently performed. Explore Scala's lazy evaluation features like by name parameters and lazy val. Look at similar lazy matrix libraries for inspiration. Comment on the issue with a proposed design and ask maintainers for feedback on feasibility and direction.