fix options, error check, logs

Issues fixed:

• Check if input file exists (instead of crash)
• Fix unknown option problem (--output)
• Fix NVGRAPH_STATUS_INVALID_VALUE in sssp()
• Report error for unknown command (instead of nothing)
• Give graph info for triangle-count

readMtx uses header

MatrixMarket files .mtx were previously read as asymmetric graphs, and isolated vertices were ignored. Now

• If .mtx is not in cordinate format, read is aborted.
• If .mtx is symmetric or skew-symmetric, both forward and reverse edges are added.
• Isolated vertices are added to graph, so that number of vertices equals the given matrix rows/cols.

ready player one

Documentation was written.

w/ --repeat

--repeat can be used to run the core nvGraph function multiple times (say 10).

$ nvgraph pagerank -o out.json ~/data/web-Google.mtx -r 10 -a 0.85 -t 1e-6

Also fixed .mtx reading to handle weights and symmetric matrices.

fix commands

These are the fixes:

• Add --full option for results
• Add --alpha and --beta options for traversal-bfs
• Remove self-loops, upper-triangular values for triangle-count
• Fix source vertex index for sssp and traversal-bfs

w/ sssp

sssp command is now working with the following options:

• --output: set the output JSON/YAML file (optional)
• --format: set the output format (json)
• --source: set the source vertex (1)

Todo:

• help command, command --help
• help, --help

w/ triangle-count

triangle-count command is now working with the following options:

• --output: set the output JSON/YAML file (optional)
• --format: set the output format (json)

Todo:

• help command, command --help
• help, --help

w/ traversal-bfs

traversal-bfs command is now working with the following options:

• --output: set the output JSON/YAML file (optional)
• --format: set the output format (json)
• --source: set the source vertex (1)

Todo:

• help command, command --help
• help, --help

w/ pagerank

pagerank command is now working with the following options:

• --output: set the output JSON/YAML file (optional)
• --format: set the output format (json)
• --alpha: set the damping factor (0.85)
• --tolerance: set the convergence error (1e-6)
• --max_iter: set the max number of rounds (500)

Todo:

• help command, command --help
• help, --help