# MaltParser

Modified: August 21 2011

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##### Get MaltParser

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##### Documentation

- Introduction
- Installing MaltParser
- User guide
- Options (short version)
- Options (long version)
- JavaDoc

##### Resources

- Pre-trained models
- Plugin
- Publications
- CoNLL Shared Task

##### Contact

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## MaltParser 1.6 - Available options

All options are categorized into one of the following option groups: system, config, singlemalt, input, output, graph, nivre, 2planar, planar, covington, lib, guide, pproj. Every option can have the following attributes:

Attribute | Description
--- | ---
name | The name of the option
type | There are following option types:
unary | The option has no value, this type is only used by the help option to indicate that help should be displayed.
bool | Boolean option, can take either true or false value.
integer | Integer option, can take an integer value.
string | String option, can take a string value.
enum | Enum option, can only take a predefined value.
stringenum | StringEnum option, can either take a string value or a predefined value.
class | Class option, can take a predefined value that corresponds to a class in the MaltParser distribution.
flag | A short version option indicator.
default | If there is a default value it is specified by this attribute.
usage | Indicates the usage of the option:
train | The option is only relevant during learning.
process | The option is only relevant during processing (parsing)
both | The option is relevant both during learning and processing (parsing)
save | The option is saved during learning and cannot be overridden during processing (parsing)

All the option groups and options are described in detail below. An option begins with the following format if the attribute is applicable:

####

name | -flag | type | default value | usage

### system

The system option group contains options that have a special status, because they control the overall system. These options can only have one value each. For instance, you cannot specify more than one option file.

####

option_file | -f | string |  |

There are several ways to control MaltParser and one way is to supply all options in an option file. The option_file option can be used to specify the path to this option file.

####

help | -h | unary |  |

Displays a short description of all available options.

####

verbosity | -v | enum | info |

There are several levels of verbosity for the system output stream, from showing all debugging messages (which can be useful when modifying or extending the source code of MaltParser) to turning off all messages. MaltParser uses Apache log4j logging services. To find out more about the different levels please consult the Apache log4j documentation. The default verbosity level is info, which means that all error, warning and informational messages are displayed.

off | Logging turned off
fatal | Logging of very severe error events
error | Logging of error events
warn | Logging of harmful situations
info | Logging of informational messages
debug | Logging of debugging messages

### config

The config option group contains general options for a configuration.

####

name | -c | string |  | both

The configuration name is the name of the configuration and also the name of the MaltParser configuration file, which ends with the file suffix .mco. The name is your own choice, but it is appropriate to give the configuration a name that reflects the content. This option must always be specified, except when the url option is used instead of name.

####

url | -u | string |  | both

It is possible to specify a URL to the configuration file instead of specifying the configuration name. For example, if you have a configuration file with the following URL: `http://maltparser.org/mco/test.mco` you can write `-u http://maltparser.org/mco/test.mco`.

####

flowchart | -m | enum | parse | both

There are seven predefined flow charts.

learn | Learn a Single MaltParser configuration
parse | Parse with a Single MaltParser configuration
info | Prints the info file of a configuration
unpack | Unpacks a configuration
convert | Simple format converter
analyze |
proj | Projectivizes input data using a configuration
deproj | Deprojectivizes input data using a configuration
learnwo | Same as learn, but also outputs the graphs to file specified by the flag -o
testdata | Generates test instances to run experiments with a learner outside MaltParser. Use for example the flag -li true to save instances.

####

type | -t | class | singlemalt | both

MaltParser 1.6 has one available configuration type: singlemalt. Later releases may contain additional configuration types. For example, one type could be an ensemble parser configuration containing many single malt configurations.

singlemalt | Single Malt Parser configuration

####

workingdir | -w | string | user.dir | both

By default the working directory is the directory where MaltParser is started from, but it is possible to specify another directory with the workingdir option.

####

logging | -cl | enum | info | both

In contrast to the system-verbosity option, the logging option controls the level of verbosity of an individual configuration. The different verbosity or logging levels are the same as for the system-verbosity option.

off | Logging turned off
fatal | Logging of very severe error events
error | Logging of error events
warn | Logging of harmful situations
info | Logging of informational messages
debug | Logging of debugging messages

####

logfile | -lfi | string | stdout | both

By default the logging will be output to the standard output stream, but it is possible to direct this output stream to a logging file by specifying the logfile option.

### singlemalt

The singlemalt option group is used when the singlemalt configuration type is specified.

####

mode | -sm | enum | parse | both

This option is replaced by --config-flowchart and should not by used anymore. The value of this option will be mapped to --config-flowchart.

learn |
parse |

####

parsing_algorithm | -a | class | nivreeager | save

The single malt configuration contains seven deterministic parsing algorithms. Four algorithms produce projective dependency graphs: Nivre arc-eager, Nivre arc-standard, Covington projective and Stack projective. Three algorithms are able to produce non-projective graphs: Covington non-projective, Stack eager and Stack lazy. Nivre's parsing algorithms have an option group called nivre, for controlling the behavior of the algorithm, Covington's algorithms have a corresponding option group called covington. For more information about the parsing algorithm see the user guide: Parsing Algorithms.

nivreeager | Nivre arc-eager
nivrestandard | Nivre arc-standard
covnonproj | Covington non-projective
covproj | Covington projective
stackproj | Stack projective
stackeager | Stack eager
stacklazy | Stack lazy
planar | Planar eager
2planar | 2-Planar eager

####

guide_model | -gm | class | single | save

MaltParser 1.6 has one available guide model type: single. Later releases may contain additional guide model types.

single | Classic guide

####

null_value | -nv | enum | one | save

MaltParser 1.6 and later versions (implemented in Java) have the possibility of distinguishing between different kinds of null-values when extracting the feature vector. For input columns like `POSTAG` it is possible to differentiate two null-values:

- `NO NODE`: There exists no corresponding dependency graph node (e.g., because the lookahead extend beyond the end of the string), which means that the feature is really undefined.
- `ROOT NODE`: The dependency graph node is a root node, which means that it is not possible to extract an input column value (for example, the word form or the part-of-speech).

In addition to the two null value categories for input columns, there is one more for the output columns:

- `NO VALUE`: The dependency graph node exists and is not the root, but has not yet been assigned a value for the output column requested (e.g., has not been assigned a head and therefore does not have a dependency type).

With this option it is possible to specify the degree of differentiation of null-values.

- `none`: Excludes all kinds of null-values when extracting the feature vector, this option value is not possible for learning methods that have symbolic feature vector encoding.
- `one`: Maps all kinds of null values to one symbol.
- `rootnode`: Distinguishes between `NO NODE` and `ROOT NODE`, and the `NO VALUE` null-value case is mapped to the `ROOT NODE` null-value for output columns.
- `novalue`: Distinguishes between `NO NODE` and `ROOT NODE` for both input and output columns, and `NO VALUE` for output columns.

none | Excludes all types of null values
one | Maps all kinds of null values to one symbol
rootnode | Distinguish between no node and root node
novalue | Distinguish between no node and root node, and no value for output column

####

diagnostics | -di | bool | false | both

If true ,then diagnostics is written to standard out or the file specified by option diafile. By default this option is false.

####

diafile | -dif | string | stdout | both

By default the diagnostics will be output to the standard output stream, but it is possible to direct this output stream to a diagnostics file by specifying the diafile option.

####

use_partial_tree | -up | bool | false | save

If true, then partial trees are allowed as input and the parser will construct these partial trees before parsing. By default this option is false. Please see the user guide: Partial trees

####

propagation | -fp | string |  | save

The propagation option is used for specifying the propagation specification file, which is an XML file (see user guide: Propagation)

### input

The input option group contains options that control the input data. In MaltParser 1.6, the values of options in the input option group must match the values of corresponding options in the output option group. This restriction is likely to be removed in later releases.

####

infile | -i | string |  | both

The input data file is specified by the infile option. It is important that the input data file is formatted according to the format specified by the format option. For example, if format=conllx the input file should at least contain eight columns during learning and six column during parsing.

####

format | -if | stringenum | conllx | save

This option tells the parser which format is used in the input data file. The format is defined in an XML file. For more information see the user guide: Input and output format. There are two data format specification files in the MaltParser distribution (included in malt.jar):

- conllx defines the CoNLL-X shared task format
- malttab defines the Malt-TAB format.

conllx | CoNLL-X data format
malttab | MaltTAB data format

####

reader | -ir | class | tab | both

In MaltParser 1.6 there are ine input reader:

- tab reads tab-separated files and with columns defined by the input format.

tab | Tab-separated reader

####

charset | -ic | string | UTF-8 | save

The charset option defines the character set of the input data file, for example, `UTF-8` or `ISO8858-1`.

####

reader_options | -iro | string |  | both

MaltParser has several data readers and with this option it is possible to control individual data readers.

####

iterations | -it | integer | 1 | both

Number of iterations over the input file.

### output

The output option group contains options that control the output data. In MaltParser 1.6, the values of options in the output option group must match the values of corresponding options in the input option group. This restriction is likely to be removed in later releases.

####

outfile | -o | string |  | both

The output data file is specified by the outfile option.

####

format | -of | stringenum |  | both

This option tells the parser which format is used for the output data file. The format is defined in an XML file. For more information see the user guide: Define your own input/output format. There are two data format specification files in the MaltParser distribution (included in malt.jar):

- conllx defines the CoNLL-X shared task format
- malttab defines the Malt-TAB format.

conllx | CoNLL-X data format
malttab | MaltTAB data format

####

writer | -ow | class | tab | both

In MaltParser 1.6 there is two output writer:

- tab reads tab-separated files with columns defined by the input format.
- negra reads line-oriented files similar to the Negra export format.

tab | Tab-separated writer

####

charset | -oc | string | UTF-8 | save

The charset option defines the character set of the output data file, for example, `UTF-8` or `ISO8858-1`.

####

writer_options | -owo | string |  | both

MaltParser has several data writers and with this option it is possible to control individual data writers.

### graph

The graph option group controls internal data structures, such as the sentence and the dependency graph.

####

max_sentence_length | -gsl | integer | 256 | both

By default, the maximum sentence length is 256 tokens. If the input data file has sentences that are longer than 256 tokens, this option may be used to adjust the internal data structures, so that longer sentences can be loaded. This option is deprecated, there is no upper limit of the sentence length.

####

root_label | -grl | string | ROOT | save

Default label used for unattached tokens that are automatically attached to the special root node after parsing is completed.

####

head_rules | -ghr | string |  | save

It is possible to define head finding rules to control the transformation from phrase structure to dependency structure. For more information see the user guide: Head-finding rules.

### nivre

The nivre option group controls the Nivre arc-eager and Nivre arc-standard parsing algorithms.

####

root_handling | -r | enum | normal | save

The root_handling option specifies how dependents of the special root node are handled.

strict | Root dependents not attached during parsing (attached with default label afterwards), reduction of unattached tokens not permissible
relaxed | Root dependents not attached during parsing (attached with default label afterwards), reduction of unattached tokens permissible
normal | Root dependents attached by RightArc transition during parsing (unattached tokens attached with default label afterwards)

### 2planar

The 2-planar option group controls the 2-planar parsing algorithm.

####

reduceonswitch | -2pr | bool | false | save

If reduceonswitch=true, the parser reduces the active stack immediately after switching stacks.

####

planar_root_handling | -prh | enum | normal | save

The planar_root_handling option specifies how dependents of the special root node are handled in the 2-planar parser.

relaxed | Root dependents not attached during parsing (attached with default label afterwards).
normal | Root dependents attached by RightArc transition during parsing (unattached tokens attached with default label afterwards).

### planar

The planar option group controls the Nivre planar parsing algorithm.

####

connectedness | -pcon | enum | none | save

If connectedness=true, the parser only generates connected dependency graphs.

none | Don't enforce connectedness at all, words whose head the parser doesn't know will be linked to the root node. With this option, the parser will work with planar dependency forests. A forest may be seen as a tree by considering all the roots linked to the dummy root node, but it needn't be planar when seen this way.
reduceonly | The last node in a connected component cannot be reduced. No restrictions on shift transitions. This option guarantees that the dependency graph obtained counting links to the dummy root node is planar and connected.
full | Enforce full connectedness by not only not allowing to reduce the last node in a component, but not allowing to shift the last word if the graph is not connected. The produced graph will be connected and planar even without considering the dummy root node.

####

acyclicity | -pacy | bool | true | save

If acyclicity=true, the parser only generates acyclic dependency graphs.

####

no_covered_roots | -pcov | bool | false | save

If covered_roots=true, the parser disallows covered roots (i.e. disallows non-projective structures, while with this option set to false, it allows planar structures that are not projective).

### covington

####

allow_root | -cr | bool | true | save

If allow_root=true, the parser treats the special root node as a token during parsing, allowing root dependents to be attached with a RightArc transition; otherwise root dependents are not attached during parsing. In both cases, unattached tokens are attached to the special root node with the default label after parsing is completed.

####

allow_shift | -cs | bool | false | save

If allow_shift=true, Shift is a valid transition, allowing the parser to skip remaining tokens in Left; otherwise all tokens in Left must be inspected before the next token is shifted.

### lib

This group contains options that are specific for the liblinear and libsvm learner.

####

options | -lo | string |  | save

There are many LIBSVM options (see LIBSVM Documentation). Note that all whitespace is replaced by underscore if this option is specified in the command-line prompt. For example, it could look like this: `-lo -s_0_-t_1_-d_2_-g_0.2_-c_1_-r_0_-e_1.0`. Liblinear have several options (see liblinear Documentation) that you can specify with this option. Note that all whitespace is replaced by underscore if this option is specified in the command-line prompt. For example, it could look like this: `-lo -s_4_-c_0.1`

####

external | -lx | string |  | train

Path to `train` or `svm-train` executable file of the liblinear or the libsvm package.

####

save_instance_files | -li | bool | false | save

If save_instance_files=true, training instance files are saved in the configuration, otherwise these files are deleted. The training instance files are not used during parsing.

####

verbosity | -lv | enum | silent | train

Verbosity of the liblinear or the libsvm package

silent | No output from the liblinear or the libsvm package is logged.
error | Only the error stream of the liblinear or the libsvm package is logged.
all | All output of the liblinear or the libsvm package is logged.

### guide

Contains options that are specific for the guide, which can be seen as an interface (or glue) between the parsing algorithm and the learner. During learning, the parsing algorithm sends training instances to the guide, which prepares the corresponding feature vectors that are sent to the learner. During parsing, the parsing algorithm requests the prediction of parser actions from the guide, which means that the guide prepares the feature vectors that are sent to the classifier (which makes use of the model induced in the learning phase).

####

features | -F | stringenum |  | save

The features option is used for specifying the feature model specification file, which is an XML file (see user guide: Feature model) or a text file with the file suffix .par (see user guide of MaltParser 0.x (C-impl) Feature Models). If no feature specification file is specified, the parser will use a default feature model specification for the given parsing algorithm that is included in the MaltParser distribution (included in the malt.jar file).

nivreeager | Nivre arc-eager default model
nivrestandard | Nivre arc-standard default model
covnonproj | Covington non-projective default model
covproj | Covington projective default model
stackproj | Stack projective default model
stackeager | Stack projective default model
stacklazy | Stack projective default model
planar | Planar arc-eager default model
2planar | 2-Planar arc-eager default model

####

data_split_column | -d | string |  | save

For some learning methods (like LIBSVM) it is impractical to induce a single model based on all training instances. With the data_split_column, data_split_structure and data_split_threshold options it is possible to define how the guide should split up the training instances to train several models. Note: Usually this will result in a slight drop in accuracy but a significant decrease in learning time. The option data_split_column indicates which input column in the data format specification file should be used for splitting up the training instances, for example, `-d POSTAG` or `-d CPOSTAG`. It is not a good idea to use fine-grained features, such as LEMMA or FORM, since this would result in thousands of models.

####

data_split_structure | -s | string |  | save

For some learning methods (like LIBSVM) it is impractical to induce a single model based on all training instances. With the data_split_column, data_split_structure and data_split_threshold options it is possible to define how the guide should split up the training instances to train several models. Note: Usually this will result in a slight drop in accuracy but a significant decrease in learning time. The option data_split_structure specifies the data structure that should be used for splitting up the traning instances. For example, with Nivre's parsing algorithm it is possible to use the top token on the stack (`-s Stack[0]`) or the next input token (`-s Input[0]`); for Covington's algorithms it should be either `-s Left[0]` or `-s Right[0]`.

####

data_split_threshold | -T | integer | 50 | save

For some learning methods (like LIBSVM) it is impractical to induce a single model based on all training instances. With the data_split_column, data_split_structure and data_split_threshold options it is possible to define how the guide should split up the training instances to train several models. Note: Usually this will result in a slight drop in accuracy but a significant decrease in learning time. The option data_split_threshold specifies the frequency threshold for training a separate model. For example, `-T 100` means that all training sets that contain less than 100 instances will be merged into a default training set.

####

kbest | -k | integer | -1 | save

The classifier can produce a k-best list of predicted parser actions. The kbest option indicates how many items the k-best list should contain. If `-k -1`, all possible parser actions are ranked in the k-best list. If `-k 1`, there is only one prediction in the k-best list. MaltParser 1.6 (behavior ≠ malt0.4) only makes use of the k-best list when the parser action is not permissible. Later releases of MaltParser will make use of the k-best list in a more intelligent way. If --malt0.4-behavior=true, this option will be overridden with k=1.

####

kbest_type | -kt | class | rank | process

The classifier can produce a k-best list of predicted parser actions.

rank | Only ranked list

####

learner | -l | class | libsvm | save

This option specifies the learning method (learner package). MaltParser 1.6 includes the LIBSVM learner and the LIBLINEAR learner.

libsvm | LIBSVM learner
liblinear | LIBLINEAR learner

####

decision_settings | -gds | string | T.TRANS+A.DEPREL | save

This option specifies how a parser action is combined or divided. By default, arc label(s) and transition are combined into one individual decision. For more information see the user guide: Prediction strategy.

####

classitem_separator | -gcs | string | ~ | save

By default the combination of transition and dependency type into one class is separated by an underscore. If some dependency label contains an underscore, this could mess up the separation of the class. Therefore another classitem_separator should be used in this case.

### pproj

####

marking_strategy | -pp | enum | none | save

Marking strategy for pseudo-projective transformation.

none | No pseudo-projective transformation
baseline | Projectivizes input data
head | Projectivizes input data with head encoding for labels
path | Projectivizes input data with path encoding for labels
head+path | Projectivizes input data with head and path encoding for labels

####

covered_root | -pcr | enum | none | save

Attachment strategy for covered roots.

none | No covered root transformation; covered roots treated as any other node
ignore | No covered root transformation; covered roots ignored in projectivity tests (old implementation of none)
left | Attach covered roots to the left end of the shortest covering arc
right | Attach covered roots to the right end of the shortest covering arc
head | Attach covered roots to the head of the shortest covering arc

####

lifting_order | -plo | enum | shortest | save

Lifting order, in case a dependency graph contains multiple non-projective arcs.

shortest | Lift the shortest arcs first (break ties from left to right)
deepest | Lift the most deeply nested arcs first (break ties from left to right)