To build this project please install Golang and dep, then on mac/linux run build.sh

Golang: https://golang.org/doc/install\ Dep: https://github.com/golang/dep#installation

###Running the program Please run the right version of the binary for the os. Under output folder there are 3 file

1. cps842-linux
2. cps842-mac
3. cps842-win

####Run invert Program help, using the -h flag

./cps842 invert -h
Take a collection of documents and generate its inverted index.

Usage:
  cps842 invert [flags]

Flags:
  -f, --file string            The location of CACM collection (required)
  -h, --help                   help for invert
  -o, --output-folder string   The location to output the final files (required)
  -p, --porter                 enable Porter's Stemming algorithm
  -s, --stop-word string       add stop word removal

To run the program without porter stemming/ stop word and assuming the input file is cacm.all

./cps842 invert -f cacm.all -o "./data"

With stop word

./cps842 invert -f cacm.all -o "./data" -s common_words

For Porter's Stemming algorithm and to lower case every word add either -p or -l flags to the run.

Ex of all the flags, ./cps842 invert -f cacm.all -o "./data" -s common_words -l -p

####Run search

Program help, using the -h flag

./cps842 search -h
Search for the best documents match using cos-sim and output the best match

Usage:
  cps842 search [flags]

Flags:
  -f, --folder string   Folder location where posting/doc files are (required)
  -h, --help            help for search
  -i, --interact-mode   Interact with the user
  -s, --search string   What to search for

Given that the posting file is in the folder data. Run the following command to execute the program

 ./cps842 search -f ./data -s "<term/sent>"

Or to use the interact mode

 ./cps842 search -f ./data -i

####Run eval Program help, using the -h flag

./cps842 eval -h
Evaluate the performance of the IR system, output will be the average MAP and R-Precision values over all queries

Usage:
  cps842 eval [flags]

Flags:
  -f, --folder string   Folder location where the posting/doc files are (required)
  -h, --help            help for eval
  -r, --qrels string    The qrels.text file
  -q, --query string    The query file
  -c, --cosSimW float   The cosine similarity score weight (w1)
  -p, --pageRankW float The PageRank score weight (w2)

Given that the input folder isdata, qrels ./input/qrels.text and query is ./input/query.text . Run the following command to execute the program

./cps842 eval -f data -r ./input/qrels.text -q ./input/query.text