This document discusses programming with Prolog and the logic programming paradigm. It introduces Prolog, a logic programming language based on predicate logic. Prolog programs consist of facts and rules about objects and relationships between objects. Queries can then be made to infer facts based on the rules. The key idea of logic programming is that a program describes a problem rather than how to solve it - the computer uses deductive reasoning to find solutions that satisfy the facts and rules. Examples of Lisp functions and Prolog programs are provided to illustrate recursive list processing and logic programming with predicates, facts, and rules.
Querying your database in natural language was a presentation done during PyData Silicon Valley 2014, based on the quepy software project. More information at:
http://pydata.org/sv2014/abstracts/#197
https://github.com/machinalis/quepy
Querying your database in natural language by Daniel Moisset PyData SV 2014PyData
Most end users can't write a database query, and yet, they often have the need to access information that keyword-based searches can't retrieve precisely. Lately, there's been an explosion of proprietary Natural Language Interfaces to knowledge databases, like Siri, Google Now and Wolfram Alpha. On the open side, huge knowledge bases like DBpedia and Freebase exists, but access to them is typically limited to using formal database query languages. We implemented Quepy as an approach to provide a solution for this problem. Quepy is an open source framework to transform Natural Language questions into semantic database queries that can be used with popular knowledge databases like, for example, DBPedia and Freebase. So instead of requiring end users to learn to write some query language, a Quepy Application can fills the gap, allowing end users to make their queries in "plain English". In this talk we would discuss the techniques used in Quepy, what additional work can be done, and its limitations.
Querying your database in natural language was a presentation done during PyData Silicon Valley 2014, based on the quepy software project. More information at:
http://pydata.org/sv2014/abstracts/#197
https://github.com/machinalis/quepy
Querying your database in natural language by Daniel Moisset PyData SV 2014PyData
Most end users can't write a database query, and yet, they often have the need to access information that keyword-based searches can't retrieve precisely. Lately, there's been an explosion of proprietary Natural Language Interfaces to knowledge databases, like Siri, Google Now and Wolfram Alpha. On the open side, huge knowledge bases like DBpedia and Freebase exists, but access to them is typically limited to using formal database query languages. We implemented Quepy as an approach to provide a solution for this problem. Quepy is an open source framework to transform Natural Language questions into semantic database queries that can be used with popular knowledge databases like, for example, DBPedia and Freebase. So instead of requiring end users to learn to write some query language, a Quepy Application can fills the gap, allowing end users to make their queries in "plain English". In this talk we would discuss the techniques used in Quepy, what additional work can be done, and its limitations.
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I am Simon M. I am a Stochastic Processes Assignment Expert at statisticshomeworkhelper.com. I hold a Ph.D. in Stochastic Processes, from Texas, USA. I have been helping students with their homework for the past 7 years. I solve assignments related to Stochastic Processes. Visit statisticshomeworkhelper.com or email info@statisticshomeworkhelper.com. You can also call on +1 678 648 4277 for any assistance with Stochastic Processes Assignments.
Video and slides synchronized, mp3 and slide download available at URL http://bit.ly/1ZW7TDL.
Richard Dallaway shows an example of what Scala looks like when using pattern matching over classes, how to encode an idea into types and use advanced features of Scala without complicating the code. Filmed at qconlondon.com.
Richard Dallaway is a partner at Underscore -- a consultancy specializing in Scala, especially the type-driven and functional aspects of Scala. He works on client projects writing software and helping teams deliver software with Scala. His focus is on the web, machine learning, and code review. He's the co-author of "Essential Slick" (Underscore), and author of the "Lift Cookbook" (O'Reilly).
I am Kennedy, G. I am a Stochastic Processes Assignment Expert at excelhomeworkhelp.com. I hold a Ph.D. in Stochastic Processes, from Indiana, USA. I have been helping students with their homework for the past 7 years. I solve assignments related to Stochastic Processes. Visit excelhomeworkhelp.com or email info@excelhomeworkhelp.com. You can also call on +1 678 648 4277 for any assistance with Stochastic Processes Assignments.
I am Simon M. I am a Stochastic Processes Assignment Expert at statisticshomeworkhelper.com. I hold a Ph.D. in Stochastic Processes, from Texas, USA. I have been helping students with their homework for the past 7 years. I solve assignments related to Stochastic Processes. Visit statisticshomeworkhelper.com or email info@statisticshomeworkhelper.com. You can also call on +1 678 648 4277 for any assistance with Stochastic Processes Assignments.
Video and slides synchronized, mp3 and slide download available at URL http://bit.ly/1ZW7TDL.
Richard Dallaway shows an example of what Scala looks like when using pattern matching over classes, how to encode an idea into types and use advanced features of Scala without complicating the code. Filmed at qconlondon.com.
Richard Dallaway is a partner at Underscore -- a consultancy specializing in Scala, especially the type-driven and functional aspects of Scala. He works on client projects writing software and helping teams deliver software with Scala. His focus is on the web, machine learning, and code review. He's the co-author of "Essential Slick" (Underscore), and author of the "Lift Cookbook" (O'Reilly).
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1. CSE240 – Introduction to
Programming Languages
Lecture 22:
Programming with Prolog I
Javier Gonzalez-Sanchez
javiergs@asu.edu
javiergs.engineering.asu.edu
Office Hours: By appointment
3. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 3
Example 1
; A function that return the leftmost even member."
(defun find-even (L)
(if (null L)
nil
(if (evenp (first L))
(first L)
(find-even (rest L))
)
)
)
4. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 4
Example 2
; develop recursive functions that traverse a list
; and count its elements
(defun recursive-list-length (L)
(if (null L)
0
(1+ (recursive-list-length (rest L)))
)
)
5. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 5
Example 3
; defines a function (get N L) that returns the N member
; of list L –assuming that the elements are numbered from ; zero
onwards
(defun get (N L)
(if (null L)
nil
(if (zerop N)
(first L)
(get (1- N) (rest L))
)
)
)
8. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 8
Logic Paradigm
• It focus on what is needed (requirements), instead of how to
implement them. It just describe what the problem is and let the
computer find a way to solve the problem, instead describing how to
solve the problem.
• It rely on the environment to find solutions that meet requirements.
9. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 9
Predicate Logic
• It uses a simplified variation of predicate logic syntax, which is similar
to natural language.
• Predicate logic eliminate all unnecessary words from sentences, then
transform the sentence by placing the relationship (predicate) first
and grouping the objects (arguments) after the relationship
predicate (object, object, object ....)
10. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 10
Natural Language Predicate Logic Type of Predicate
A car is fast. fast(car). fact
A rose is red. red(rose). fact
Bill likes the car if the car is fast. likes(bill, car) :- fast(car). rule
Humidity is high if it rains high(humidity):- rains(). rule
Jane is mother of Elaine mother_of(jane, elaine). fact
Jane is mother of Mike mother_of(jane, mike). fact
David is father of Jesse father_of(david, jesse). fact
Jesse is father of Obed father_of(jesse, obed). fact
Grandmother X of Z if (X is mother of Y
and (Y is mother of Z or Y is father of Z)
grandmother_of(X, Z) :- mother_of(X, Y),
( mother_of(Y, Z); father_of(Y, Z) ).
rule
11. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 11
Predicate Logic
• Facts: What is known, e.g.,
Bill likes car and bike, and he travels with one of them
likes(bill, car), likes(bill, bike)
travels(bill, car); travels(bill, bike)
• Rules: What you can infer from the given facts. Rules enable you to
infer facts from other facts, e.g.,
Bill is the father of Joe, if Joe is the son of bill.
father(bill, joe) :- son(joe, bill).
, means AND
; means OR
12. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 12
Prolog
• PROLOG (PROgramming LOGic)
• Interpreter.
• Deductive database: set of statements and a deduction system.
• Facts and Rules
• Queries
• Upper-Case variables
• Lower-Case constants and names
13. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 13
Install a Prolog Interpreter
SWI - Prolog
http://www.swi-prolog.org/download/stable
14. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 14
Install a Prolog Interpreter
To enter rules from the command line, type this :
[user].
This puts you in a mode where you can enter facts and rules. Otherwise you get this kind of
message:
ERROR: Undefined procedure: (DWIM could not correct goal)
You can then enter facts (or rules) e.g. :
father(me,sarah).
After having entered the knowledge, type CONTROL-D to come back to the mode where you
can enter questions. Then you can ask:
?- father(me,X).
X = sarah
To quit:
halt.
16. Javier Gonzalez-Sanchez | CSE 240 | Fall 2017 | 16
Summary
Logic/Declarative Paradigm
Key idea:
A program is a set of facts about
objects,
rules about objects, and questions
(queries) about the relations between
objects.
Features:
• get rid of programming altogether.
17. CSE240 – Introduction to Programming Languages
Javier Gonzalez-Sanchez
javiergs@asu.edu
Fall 2017
Disclaimer. These slides can only be used as study material for the class CSE240 at ASU. They cannot be distributed or used for another purpose.