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gilbert's Introduction

gilbert

Distributed Linear Algebra on Sparse Matrices

% load network dataset
numVertices = 50000000;
N = load("hdfs://datasets/largenetwork.csv", numVertices, numVertices);

% create the adjacency matrix 
A = spones(N);

% outdegree per vertex
d = sum(A, 2);

% create the column-stochastic transition matrix
T = (diag(1 ./ d) * A)';

% initialize the ranks
r_0 = ones(numVertices, 1) / numVertices;

% compute PageRank
e = ones(numVertices, 1);

ranks = fixpoint(r_0, @(r) (.85 * T * r + .15 * e));

% save result
write(ranks, "hdfs://results/pageranks.csv");

gilbert's People

Contributors

tillrohrmann avatar gilbert-lang avatar asubmissions avatar

Stargazers

Xiong Jun Wu(熊君武) avatar avatar Robert Metzger avatar avatar

Watchers

Robert Metzger avatar avatar avatar

Forkers

jkirsch standardgalactic

gilbert's Issues

Better error support of typer

Typer should give better contextual information in the case of an error. E.g. line numbers and printing the region where the error occurred.

Documentation of Typer and Parser

The Typer and Parser classes are extremely hard to read. They need extensive comments and references to used algorithms/comments.

Immutable variables

Explicit support for immutable variables to support the functional programming paradigm.

Type annotations

Introduction of type annotations to resolve typing problems. Possible approaches:

  1. Matlab comment
  2. New keyword in Matlab, but this makes it difficult to let the program run in the native Matlab environment

Comments and self-explaining variable names

The following classes partially have very cryptic variable and method names. That makes the code extremely hard to read.

org.gilbertlang.language.definition.BuiltinSymbols
org.gilbertlang.language.definition.ConvenienceMethods
org.gilbertlang.language.definition.Types
org.gilbertlang.language.definition.Values
org.gilbertlang.language.definition.Lexer
org.gilbertlang.language.definition.Parser

The variables and methods should be renamed to make the code easier to read.

Fixpoint operator

Integration of a fixpoint operator as a replacement for side effect free while loops.

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