Chapter 5: Context - Free Grammar
Chapter 5: Context - Free Grammar
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S-Grammars and Contemporary
Programming Languages
Many features of Pascal-like programming languages can
be expressed with s-grammars.
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Ambiguity
A context- free grammar G is said ... which
w∈L(G) is derived.
Chapter 5: Context- Free Grammar
Quan Thanh Tho
qttho@cse.hcmut.edu.vn
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Example 5.8
S → SS | aSb | bSa | λ w = aabb
21
Exhaustive Search Parsing
•...
Tài liệu Báo cáo khoa học: "Efficient Parsing for Bilexical Context-Free Grammar sand Head Automaton Grammars*" pptx
... subderivations into a full parse.
2 Notation for context- free
grammars
The reader is assumed to be familiar with
context- free grammars. Our notation fol-
1Other relevant parsers simultaneously consider ...
• For bilexicalized context- free grammars,
O(n 4) is possible.
• The O(n 4) result also holds for head au-
tomaton grammars.
• For a very common special case of these...
Báo cáo khoa học: "Lexicalized Context-Free Grammars" pot
...
Lexicalized context- free grammar (LCFG) is
an attractive compromise between the parsing ef-
ficiency of context- free grammar (CFC) and the
elegance and lexical sensitivity of lexicalized tree-
adjoining ...
Shanker, and Weir, 1991; Vijay-Shanker and Weir,
1993a) that generate only a small superset of
context- free languages. One such formalism is lex-
icalized tree-adjo...
Báo cáo khoa học: "PARALLEL MULTIPLE CONTEXT-FREE GRAMMARS, FINITE-STATE TRANSLATION SYSTEMS, AND POLYNOMIAL-TIME RECOGNIZABLE SUBCLASSES OF LEXICAL-FUNCTIONAL GRAMMARS" docx
... "Generalized Context- Free
Grammars and Multiple Context- Free Grammars",
Trans. IEICE, J71-D-I, 5:7 5 8-7 65.
Kasami, T. et al. 1988b. "On the Membership Prob-
lem for Head Language ... significant to clarify the gen-
erative capacities of such grammars and devices.
Parallel multiple context- free grammars (pm-
cfg's)
and
multiple context- free gra...
Báo cáo khoa học: "Issues Concerning Decoding with Synchronous Context-free Grammar" docx
... inves-
tigate adding more flexibility to synchronous
context- free grammars by adding glue rules
and phrases.
1 Introduction
Synchronous context- free grammar (SCFG) is
widely used for machine translation. ... A hyper-
graph containing a unary cycle cannot be topo-
logically sorted. Many algorithms for parame-
ter tuning and coarse-to-fine decoding, such as
the inside-outside algorithm...
Báo cáo khoa học: "Parsing Non-Recursive Context-Free Grammars" doc
... Padova
via Gradenigo, 6/A
I-35131 Padova, Italy
satta@dei.unipd.it
Abstract
We consider the problem of parsing
non-recursive context- free grammars, i.e.,
context- free grammars that generate finite
languages. ... undecidable (Harrison, 1978). Following the ter-
minology adopted above, this means that parsing
a context- free input grammar
on the basis of a
context- free parsing...
Báo cáo khoa học: "PRECISE N-GRAM PROBABILITIES FROM STOCHASTIC CONTEXT-FREE GRAMMARS" pptx
... algorithm for computing n-gram probabil-
ities from stochastic context- free grammars, a procedure
that can alleviate some of the standard problems associated
with n-grams (estimation from sparse ...
contained in an existing n-gram will tell anything about the
n-grams containing the new item. Stochastic context- free
grammars (SCFGs), on the other hand, are not as suscep-
tible t...
Báo cáo khoa học: "ON THE SUCCINCTNESS PROPERTIES OF UNORDERED CONTEXT-FREE GRAMMARS" ppt
... can be described by
polynomial-size ID/LP grammars. The results have im-
plications for the description of free word order languages.
2 Introduction
Context free grammars in immediate dominance ... be called symmetric.) Ordinary context-
free grammars, on the other hand, "seem to require that
all permutations of right-hand sides of productions be ex-
plicitly listed, in ord...
Báo cáo khoa học: "Manually Constructed Context-Free Grammar For Myanmar Syllable Structure" potx
... Syllable Structure in
Context- Free Grammar
3.1 Manually Constructed Context- Free
Grammar for Myanmar Syllable
Structure
Context free (CF) grammar refers to the grammar
rules of languages ... Myanmar syllable in context-
free grammar and parse the syllables using
predictive top-down parsing technique to
determine whether a given syllable can be
recognized by...
Báo cáo khoa học: "A Probabilistic Context-free Grammar for Disambiguation in Morphological Parsing" pdf
... the MOR-
phological PArser MORPA is provided
with a probabilistic context- free grammar
(PCFG), i.e. it combines a "conventional"
context- free morphological grammar to fil-
ter ... specific context. The
ultimate effect of these tests is that incorrect recog-
nition of highly frequent and very small inflectional
suffixes, such
as -e, -t, -d, -s, -r, -n, -en
or
-...