Module utilities

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Module utilities

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Functions

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string

get_classifier(depth, pos_symbol, neg_symbol)
Find the symbol for the classifier at given depth.

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dict

dict_difference(dict1, dict2)
Difference of two dictionaries.

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dict

dict_sum(dict1, dict2)
Sum of two dictionaries.

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file handle

open_file(file)
Open a file for reading.

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dict

get_data(file, pos_symbol, neg_symbol)
Read data from a file.

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list

get_features(file)
Read features from a file.

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list

gen_substrings(data, min_len, max_len)
Generate all substrings of given lengths found in data.

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number

log2(x)
Logarithm base 2.

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number

signum(x)
Signum.

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9-tuple

parse_arguments(argv, mdl=True)
Parse commant line arguments.

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usage(mdl)
Print program usage information.

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parse_error(err, mdl)
Print given parsing error, usage of program and exit.

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Function Details

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get_classifier(depth, pos_symbol, neg_symbol)

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Find the symbol for the classifier at given depth.

Parameters:

depth (integer) - Depth of rules to classify.
pos_symbol (string) - Symbol signifying positive example in data.
neg_symbol (string) - Symbol signifying negative example in data.

Returns: string

Correct symbol for rule at given depth.

dict_difference(dict1, dict2)

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Difference of two dictionaries.

Parameters:

dict1 (dict)
dict2 (dict)

Returns: dict

data points with their classifications that are contained in dict1, but not in dict2 .

dict_sum(dict1, dict2)

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Sum of two dictionaries.

Parameters:

dict1 (dict)
dict2 (dict)

Returns: dict

data points with their classifications that are contained in at least one of the dictionaries.

open_file(file)

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Open a file for reading.

Parameters:

file (string) - Name of file to open.

Returns: file handle

Raises:

IOError - if file cannot be opened.

get_data(file, pos_symbol, neg_symbol)

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Read data from a file.

Parameters:

file (string) - Name of file to read data from.
pos_symbol (string) - Symbol signifying positive example in data.
neg_symbol (string) - Symbol signifying negative example in data.

Returns: dict

data points with their classifications.

get_features(file)

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Read features from a file.

Parameters:

file (string) - Name of file to read features from.

Returns: list

features.

gen_substrings(data, min_len, max_len)

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Generate all substrings of given lengths found in data.

Parameters:

data (dictionary) - Examples with their classifications.
min_len (integer) - Minimum length for substrings to be generated.
max_len (integer) - Maximum length for substrings to be generated.

Returns: list

substrings of given lengths.

parse_arguments(argv, mdl=True)

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Parse commant line arguments.

Parameters:

argv (list) - Command line arguments.
mdl (boolean) - True, if the arguments are for the MDL-using program.

Returns: 9-tuple

parameters' values

usage(mdl)

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Print program usage information.

Parameters:

mdl (boolean) - True, if the info is about the MDL-using program.

parse_error(err, mdl)

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Print given parsing error, usage of program and exit.

Parameters:

mdl (boolean) - True, if the error is generated by the MDL-using program.