Are Natural Languages Regular? This is an important question for two reasons: first, it places an upper bound on the running time of algorithms that process natural language; second, it may tell us something about human language processing and language acquisition.
Finite state automata (deterministic and nondeterministic finite automata) provide decisions regarding the acceptance and rejection of a string while transducers provide some output for a given input. Thus, the two machines are quite useful in language processing tasks.
Finite state automata (deterministic and nondeterministic finite automata) provide decisions regarding the acceptance and rejection of a string while transducers provide some output for a given input. Thus, the two machines are quite useful in language processing tasks.
Simply put, semantic analysis is the process of drawing meaning from text. It allows computers to understand and interpret sentences, paragraphs, or whole documents, by analyzing their grammatical structure, and identifying relationships between individual words in a particular context.
Natural Language Processing (NLP) is a branch of Artificial Intelligence (AI) that enables machines to understand human language. Its goal is to build systems that can make sense of the text and automatically perform tasks like translation, spell check, or topic classification
This is the presentation on Syntactic Analysis in NLP.It includes topics like Introduction to parsing, Basic parsing strategies, Top-down parsing, Bottom-up
parsing, Dynamic programming – CYK parser, Issues in basic parsing methods, Earley algorithm, Parsing
using Probabilistic Context Free Grammars.
TF-IDF, short for Term Frequency - Inverse Document Frequency, is a text mining technique, that gives a numeric statistic as to how important a word is to a document in a collection or corpus. This is a technique used to categorize documents according to certain words and their importance to the document
Simply put, semantic analysis is the process of drawing meaning from text. It allows computers to understand and interpret sentences, paragraphs, or whole documents, by analyzing their grammatical structure, and identifying relationships between individual words in a particular context.
Natural Language Processing (NLP) is a branch of Artificial Intelligence (AI) that enables machines to understand human language. Its goal is to build systems that can make sense of the text and automatically perform tasks like translation, spell check, or topic classification
This is the presentation on Syntactic Analysis in NLP.It includes topics like Introduction to parsing, Basic parsing strategies, Top-down parsing, Bottom-up
parsing, Dynamic programming – CYK parser, Issues in basic parsing methods, Earley algorithm, Parsing
using Probabilistic Context Free Grammars.
TF-IDF, short for Term Frequency - Inverse Document Frequency, is a text mining technique, that gives a numeric statistic as to how important a word is to a document in a collection or corpus. This is a technique used to categorize documents according to certain words and their importance to the document
Word level language identification in code-switched textsHarsh Jhamtani
Code-switching is the practice of moving back and forth between two languages in spoken or written form of communication. In this work, we address the problem of word-level language identification of code-switched sentences using linguistic and statistical features.
Welcome to International Journal of Engineering Research and Development (IJERD)IJERD Editor
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journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
1. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
Lecture Notes - Are Natural Languages Regular?
This is an important question for two reasons: first, it places an upper bound on the running time of
algorithms that process natural language; second, it may tell us something about human language
processing and language acquisition.
To answer this question let us first understand…
• What is a language (natural language / formal language)?
• What is a regular language?
• What are regular grammars?
What is a natural language?
A natural language is a human communication system. A natural language can be thought of as a
mutually understandable communication system that is used between members of some population.
When communicating, speakers of a natural language are tacitly agreeing on what strings are
allowed (i.e., which strings are grammatical). Dialects and specialized languages (including e.g.,
the language used on social media) are all natural languages in their own right.
Named languages that you are familiar with, such as French, Chinese, English etc, are usually
historically, politically or geographically derived labels for populations of speakers.
A natural language has high ambiguity.
Example: I made her duck
1. I cooked waterfowl* for her.
2. I cooked waterfowl* belonging to her.
3. I created the (plaster?) duck she owns.
4. I caused her to quickly lower her head.
5. I turned her into a duck.
Several types of ambiguity combine to cause many meanings:
• morphological (her can be a dative pronoun or possessive pronoun and duck can be a noun
or a verb)
• syntactic (make can behave both transitively and ditransitively; make can select a direct
object or a verb)
• semantic (make can mean create, cause, cook ...)
What is a formal language?
A formal language is a set of strings over an alphabet.
Alphabet: An alphabet is specified by a finite set, ∑ , whose elements are called symbols. Some
examples are shown below:
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9} the 10-element set of decimal digits.
2. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
{a, b, c, …. x, y, z} the 26-element set of lower-case characters of written English.
{aardvark, ….. zebra} the 250,000-element set of words in the Oxford English Dictionary.
The set of natural numbers N = {0, 1, 2, 3, ….} cannot be an alphabet because it is infinite.
Strings: A string of length n over an alphabet ∑ is an ordered n-tuple of elements of ∑.
∑ * denotes the set of all strings over ∑ of finite length.
If ∑ = {a, b} then ∊, ba, bab, aab are examples of strings over ∑.
If ∑ = {a} then ∑ * = {∊, a, aa, aaa, ….}
If ∑ = {cats, dogs, eat} then
∑ * = {∊, cats, cats eat, cats eat dogs, …..}
Languages: Given an alphabet ∑ any subset of ∑ * is a formal language over alphabet ∑.
What is a regular language?
A language is regular if it is equal to the set of strings accepted by some deterministic finite-state
automaton (DFA).
Regular languages are accepted by DFAs.
Given a DFA M = (Q,∑,∆,s,F) the language, L(M), of strings accepted by M can be generated by
the regular grammar Greg = (N, ∑, S,P) where:
N= {Q} the non-terminals are the states of M
∑ = ∑ the terminals, set of transition symbols of M
S = s the starting symbol is the starting state of M
3. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
P = qi → aqj when (qi , a) = qj ∊ ∆
or qi → ∊ when q ∊ F (i.e. when q is an end state)
In order to derive a string from a grammar
• start with the designated starting symbol
• then non-terminal symbols are repeatedly expanded using the rewrite rules until there is
nothing further left to expand.
The rewrite rules derive the members of a language from their internal structure (or phrase
structure).
A regular language has a left- and right-linear grammar.
For every regular grammar the rewrite rules of the grammar can all be expressed in the form:
X → aY
X → a
or alternatively, they can all be expressed as:
X → Ya
X → a
4. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
A phrase structure grammar over an alphabet ∑ is defined by a tuple G = (N, ∑, S,P). The language
generated by grammar G is L(G):
Non-terminals N: Non-terminal symbols (often uppercase letters) may be rewritten using the rules
of the grammar.
Terminals ∑ : Terminal symbols (often lowercase letters) are elements of ∑ and cannot be rewritten.
Note N ∩ ∑ = ϕ.
Start Symbol S: A distinguished non-terminal symbol S ∊ N. This non-terminal provides the starting
point for derivations.
Phrase Structure Rules P: Phrase structure rules are pairs of the form (w, v) usually written :
w → v, where w ∊ (∑ ∪ N)*N(∑ ∪ N)* and v ∊ (∑ ∪ N)*
Now lets try and the answer the question Can regular grammars model natural language?
It turns out that regular grammars have limitations when modelling natural languages for following
reasons:
• Centre Embedding
• Redundancy
• Useful internal structures
Problems using regular grammars for natural language
1. Centre Embedding
5. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
In principle, the syntax of natural languages cannot be described by a regular language due to the
presence of centre-embedding; i.e. infinitely recursive structures described by the rule, A → αAβ,
which generate language examples of the form, an
bn
.
For instance, the sentences below have a center embedded structure.
1. The students the police arrested complained.
2. The luggage that the passengers checked arrived.
3. The luggage that the passengers that the storm delayed checked arrived
Intuitively, the reason that a regular language cannot describe centre-embedding is that its
associated automaton has no memory of what has occurred previously in a string.
In order to ‘know’ that n verbs were required to match n nominals already seen, an automaton would
need to ‘record’ that n nominals had been seen; but a DFA has no mechanism to do this.
Formally, we can prove this using Pumping Lemma property to show that strings of the form anbn
are not regular.
The pumping lemma for regular languages is used to prove that a language is not regular. The
pumping lemma property is:
All w ∊ L with |w| ≥ l can be expressed as a concatenation of three strings, w = u1vu2, where u1, v
and u2 satisfy:
|v| ≥ 1 (i.e. v ≠ ∊)
u1|v| ≤ l
for all n ≥ 0, u1vnu2 ∊ L (i.e. u1u2 ∊ L, u1vu2 ∊ L, u1vvu2 2 L, u1vvvu2 ∊ L, etc.)
If you intersect a regular language with another regular language you should get a third regular
language.
Lreg1 ∩ Lreg2 = Lreg3
Also regular languages are closed under homomorphism (we can map all nouns to a and all verbs
to b)
6. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
So if English is regular and we intersect it with another regular language (e.g. the one generated by
/the a (that the a)*b*/) we should get another regular language.
if Leng then Leng ∩ La*b* = Lreg3
However the intersection of an a*b* with English is anbn ( in our example case specifically /the a
(that the a)n-1bn/), which is not regular as it fails the pumping lemma property.
but Leng ∩ La*b* = La
n
b
n
(which is not regular )
The assumption that English is regular must be incorrect.
2. Redundancy
Grammars written using regular grammar rules alone are highly redundant: since the rules are very
simple we need a great many of them to describe the language. This makes regular grammars very
difficult to build and maintain.
Useful internal structures
There are instances where a regular language can recognize the strings of a language but in doing
so does not provide a structure that is linguistically useful to us. The left-linear or right-linear
internal structures derived by regular grammars are generally not very useful for higher level NLP
applications.
We need informative internal structure so that we can, for example, build up good semantic
representations.
In practice, regular grammars can be useful for partial grammars (i.e. when we don’t need to know
the syntax tree for the whole sentence but rather just some part of it) and also when we don’t care
about derivational structure (i.e. when we just want a Boolean for whether a string is in a language).
For example, in information extraction, we need to recognize named entities.
The internal structure of named entities is normally unimportant to us, we just want to recognize
when we encounter them.
For instance, using rules such as:
NP → nnsb NP
NP → np1 NP
NP → np1
where NP is a non-terminal and nnsb and np1 are terminals representing tags from the large tagset,
you could match a titled name like, Prof. Stephen William Hawking.
7. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
For every natural language that exists, can we find a context-free grammar to generate it?
There is some evidence that natural language can contain cross serial dependencies. A small
number of languages exhibit strings of the form shown below.
There is a Zurich dialect of Swiss German in which constructions like the following are found:
mer d’chind em Hans es huus haend wele laa hälfe aastriiche.
we the children Hans the house have wanted to let help paint.
we have wanted to let the children help Hans paint the house.
Such expressions may not be derivable by a context-free grammar.
Where do natural languages fit in Chomsky hierarchy?
If we are to use formal grammars to represent natural language, it is useful to know where they
appear in the Chomsky hierarchy. With respect to natural language, it might turn out that the set of
all attested natural languages is actually as depicted in Figure.
The overlap with the context-sensitive languages which accounts for those languages that have
cross-serial dependencies.
8. Prof. Deptii Chaudhari, Department of Computer Engineering, I2IT
Natural languages are an infinite set of sentences constructed out of a finite set of characters.
Words in a sentence don’t have defined upper limits either.
When natural languages are reverse engineered into their component parts, they get broken down
into four parts - syntax, semantics, morphology, phonology.
Natural languages are believed to be at least context-free. However, Dutch and Swiss German
contain grammatical constructions with cross-serial dependencies which make them context
sensitive.
Extensions to Chomsky hierarchy that find relevance in NLP
There are two extensions to the traditional Chomsky hierarchy that have proved useful in linguistics
and cognitive science:
Mildly context-sensitive languages – CFGs are not adequate (weakly or strongly) to characterize
some aspects of language structure. To derive extra power beyond CFG, a grammatical formalism
called Tree Adjoining Grammars (TAG) was proposed as an approximate characterization of Mildly
Context-Sensitive Grammars. composition, called 'adjoining’.
Another classification called Minimalist Grammars (MG) describes an even larger class of formal
languages.
Sub-regular languages
A sub-regular language is a set of strings that can be described without employing the full power of
finite state automata. Many aspects of human language are manifestly sub-regular, such as some
‘strictly local’ dependencies.
Example – identifying recurring sub-string patterns within words is one such common application.