archer1

Usage

Overview

Archer is a standalone program that does document retrieval with AltaVista-type queries, using +, -, "", etc. The commands in the arrow examples in the manpage also work for archer.

Options

For building data structures from text files:

-i, --index=DIRNAME

Tokenize training documents found under DIRNAME, and save them to disk

--index-lines=FILENAME Like --index, except index each line of FILENAME

as if it were a separate document. Documents are named after sequential line numbers.

For doing document retreival using the data structures built with -i:

-n, --num-hits-to-show=N

Show the N documents that are most similar to the query text (default N=1)

-q, --query=WORDS

tokenize input from stdin [or FILE], then print document most like it

--query-forking-server=PORTNUM

Run archer in socket server mode, forking a new process with every connection. Allows multiple simultaneous connections.

--query-server=PORTNUM Run archer in socket server mode.

--score-is-raw-count

Instead of using a weighted sum of logs, the score of a document will be simply the number of terms in both the query and the document.

Diagnostics

-p, --print-all

Print, in unsorted order, all the document indices, positions and words

-s, --print-word-stats

Print the number of times each word occurs.

General options

--annotations=FILE

The sarray file containing annotations for the files in the index

-b, --no-backspaces

Don't use backspace when verbosifying progress (good for use in emacs)

-d, --data-dir=DIR

Set the directory in which to read/write word-vector data (default=~/.<program_name>).

--random-seed=NUM

The non-negative integer to use for seeding the random number generator

--score-precision=NUM

The number of decimal digits to print when displaying document scores

-v, --verbosity=LEVEL

Set amount of info printed while running; (0=silent, 1=quiet, 2=show-progess,...5=max)

Lexing options

--append-stoplist-file=FILE

Add words in FILE to the stoplist.

--exclude-filename=FILENAME

When scanning directories for text files, skip files with name matching FILENAME.

-g, --gram-size=N

Create tokens for all 1-grams,... N-grams.

-h, --skip-header

Avoid lexing news/mail headers by scanning forward until two newlines.

--istext-avoid-uuencode

Check for uuencoded blocks before saying that the file is text, and say no if there are many lines of the same length.

--lex-pipe-command=SHELLCMD

Pipe files through this shell command before lexing them.

--max-num-words-per-document=N

Only tokenize the first N words in each document.

--no-stemming

Do not modify lexed words with a stemming function. (usually the default, depending on lexer)

--no-stoplist

Do not toss lexed words that appear in the stoplist.

--replace-stoplist-file=FILE

Empty the default stoplist, and add space-delimited words from FILE.

--shortest-word=LENGTH Toss lexed words that are shorter than LENGTH.

Default is usually 2.

-S, --use-stemming

Modify lexed words with the `Porter' stemming function.

--use-stoplist

Toss lexed words that appear in the stoplist. (usually the default SMART stoplist, depending on lexer)

--use-unknown-word

When used in conjunction with -O or -D, captures all words with occurrence counts below threshold as the `<unknown>' token

--xxx-words-only

Only tokenize words with `xxx' in them

Mutually exclusive choice of lexers

--flex-mail

Use a mail-specific flex lexer

--flex-tagged

Use a tagged flex lexer

-H, --skip-html

Skip HTML tokens when lexing.

--lex-alphanum

Use a special lexer that includes digits in tokens, delimiting tokens only by non-alphanumeric characters.

--lex-infix-string=ARG Use only the characters after ARG in each word for

stoplisting and stemming. If a word does not contain ARG, the entire word is used.

--lex-suffixing

Use a special lexer that adds suffixes depending on Email-style headers.

--lex-white

Use a special lexer that delimits tokens by whitespace only, and does not change the contents of the token at all---no downcasing, no stemming, no stoplist, nothing. Ideal for use with an externally-written lexer interfaced to rainbow with --lex-pipe-cmd.

Feature-selection options

-D, --prune-vocab-by-doc-count=N

Remove words that occur in N or fewer documents.

-O, --prune-vocab-by-occur-count=N

Remove words that occur less than N times.

-T, --prune-vocab-by-infogain=N

Remove all but the top N words by selecting words with highest information gain.

Weight-vector setting/scoring method options

--binary-word-counts

Instead of using integer occurrence counts of words to set weights, use binary absence/presence.

--event-document-then-word-document-length=NUM

Set the normalized length of documents when --event-model=document-then-word

--event-model=EVENTNAME

Set what objects will be considered the `events' of the probabilistic model. EVENTNAME can be one of: word, document, document-then-word.

Default is `word'.

--infogain-event-model=EVENTNAME

Set what objects will be considered the `events' when information gain is calculated. EVENTNAME can be one of: word, document, document-then-word.

Default is `document'.

-m, --method=METHOD

Set the word weight-setting method; METHOD may be one of:

--print-word-scores

During scoring, print the contribution of each word to each class.

--smoothing-dirichlet-filename=FILE

The file containing the alphas for the dirichlet smoothing.

--smoothing-dirichlet-weight=NUM

The weighting factor by which to muliply the alphas for dirichlet smoothing.

--smoothing-goodturing-k=NUM

Smooth word probabilities for words that occur NUM or less times. The default is 7.

--smoothing-method=METHOD

Set the method for smoothing word probabilities to avoid zeros; METHOD may be one of: goodturing, laplace, mestimate, wittenbell

--uniform-class-priors When setting weights, calculating infogain and

scoring, use equal prior probabilities on classes.

-?, --help

Give this help list

--usage

Give a short usage message

-V, --version

Print program version

Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.