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venv/lib/python3.7/site-packages/nltk/parse/__init__.py

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+# Natural Language Toolkit: Parsers
+#
+# Copyright (C) 2001-2019 NLTK Project
+# Author: Steven Bird <stevenbird1@gmail.com>
+#         Edward Loper <edloper@gmail.com>
+# URL: <http://nltk.org/>
+# For license information, see LICENSE.TXT
+#
+
+"""
+NLTK Parsers
+
+Classes and interfaces for producing tree structures that represent
+the internal organization of a text.  This task is known as "parsing"
+the text, and the resulting tree structures are called the text's
+"parses".  Typically, the text is a single sentence, and the tree
+structure represents the syntactic structure of the sentence.
+However, parsers can also be used in other domains.  For example,
+parsers can be used to derive the morphological structure of the
+morphemes that make up a word, or to derive the discourse structure
+for a set of utterances.
+
+Sometimes, a single piece of text can be represented by more than one
+tree structure.  Texts represented by more than one tree structure are
+called "ambiguous" texts.  Note that there are actually two ways in
+which a text can be ambiguous:
+
+    - The text has multiple correct parses.
+    - There is not enough information to decide which of several
+      candidate parses is correct.
+
+However, the parser module does *not* distinguish these two types of
+ambiguity.
+
+The parser module defines ``ParserI``, a standard interface for parsing
+texts; and two simple implementations of that interface,
+``ShiftReduceParser`` and ``RecursiveDescentParser``.  It also contains
+three sub-modules for specialized kinds of parsing:
+
+  - ``nltk.parser.chart`` defines chart parsing, which uses dynamic
+    programming to efficiently parse texts.
+  - ``nltk.parser.probabilistic`` defines probabilistic parsing, which
+    associates a probability with each parse.
+"""
+
+from nltk.parse.api import ParserI
+from nltk.parse.chart import (
+    ChartParser,
+    SteppingChartParser,
+    TopDownChartParser,
+    BottomUpChartParser,
+    BottomUpLeftCornerChartParser,
+    LeftCornerChartParser,
+)
+from nltk.parse.featurechart import (
+    FeatureChartParser,
+    FeatureTopDownChartParser,
+    FeatureBottomUpChartParser,
+    FeatureBottomUpLeftCornerChartParser,
+)
+from nltk.parse.earleychart import (
+    IncrementalChartParser,
+    EarleyChartParser,
+    IncrementalTopDownChartParser,
+    IncrementalBottomUpChartParser,
+    IncrementalBottomUpLeftCornerChartParser,
+    IncrementalLeftCornerChartParser,
+    FeatureIncrementalChartParser,
+    FeatureEarleyChartParser,
+    FeatureIncrementalTopDownChartParser,
+    FeatureIncrementalBottomUpChartParser,
+    FeatureIncrementalBottomUpLeftCornerChartParser,
+)
+from nltk.parse.pchart import (
+    BottomUpProbabilisticChartParser,
+    InsideChartParser,
+    RandomChartParser,
+    UnsortedChartParser,
+    LongestChartParser,
+)
+from nltk.parse.recursivedescent import (
+    RecursiveDescentParser,
+    SteppingRecursiveDescentParser,
+)
+from nltk.parse.shiftreduce import ShiftReduceParser, SteppingShiftReduceParser
+from nltk.parse.util import load_parser, TestGrammar, extract_test_sentences
+from nltk.parse.viterbi import ViterbiParser
+from nltk.parse.dependencygraph import DependencyGraph
+from nltk.parse.projectivedependencyparser import (
+    ProjectiveDependencyParser,
+    ProbabilisticProjectiveDependencyParser,
+)
+from nltk.parse.nonprojectivedependencyparser import (
+    NonprojectiveDependencyParser,
+    NaiveBayesDependencyScorer,
+    ProbabilisticNonprojectiveParser,
+)
+from nltk.parse.malt import MaltParser
+from nltk.parse.evaluate import DependencyEvaluator
+from nltk.parse.transitionparser import TransitionParser
+from nltk.parse.bllip import BllipParser
+from nltk.parse.corenlp import CoreNLPParser, CoreNLPDependencyParser