kandi X-RAY | unification Summary
kandi X-RAY | unification Summary
unification
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Top functions reviewed by kandi - BETA
- Perform topological sort of edges .
- Context manager to context manager .
- A decorator to define a class .
- Unify an object .
- reify an object
- Convert d into a frozen dict .
- Reverse a dictionary .
- Unify u and v .
- reify e in s
- Match a function .
unification Key Features
unification Examples and Code Snippets
Community Discussions
Trending Discussions on unification
QUESTION
being a beginner of Isabelle I tried to transcribe a simple programming task from rosettacode.org 100 doors based on the Standard ML implementation.
I checked the SML code in this online SML interpreter and especially the call of foldl, which worked fine.
When applying Isabelle's foldl
i get an 'Type unification failed' error for function run
, which is unexpected, since i tried to transcribe the SML original very closely.
Any hints for what the problem is? Thanks a lot!
My code so far:
...ANSWER
Answered 2022-Apr-08 at 16:52Let's compare the Isabelle version of foldl,
QUESTION
I am using swi-prolog to produce some examples for students in the context of a Prolog course. Regarding unification I want to draw their attention to the dangers of infinite recursion in the unification process. However, mature Prolog implementations like swi-prolog are smart enough to avoid infinite recursion of the unification process in most cases. Is this true in all cases, or can more intricate examples be constructed where unification would still recurse infinitely?
...ANSWER
Answered 2022-Jan-30 at 18:05Is this true in all cases, or can more intricate examples be constructed where unification would still recurse infinitely?
AFAIK no.
I can't recall seeing where =/2 did not work as expected. Granted my expectations are of how SWI-Prolog does =/2 as noted below.
As a related side-question, why does (again, I used swi-prolog) unification binds X to Y in the following example? I didn't expect that.
See these comments in the SWI-Prolog C code for cyclic terms.
QUESTION
I would like to implement forward-chaining reasoning in Prolog. I made up a simple KB of facts and some rules, from which I should be able to get the fact green(fritz)
.
I tried to implement it but somehow, when member
fails, it stops going on.
ANSWER
Answered 2022-Jan-24 at 22:11There are several problems here.
Problem 1 is that the non-recursive clauses for your recursive predicates look like this:
QUESTION
I am solving a question on LeetCode.com called Number of Islands:
Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water.
I know how to solve it with DFS, but I am learning union-find and came up with the below approach:
...ANSWER
Answered 2022-Jan-13 at 08:53Add some debug print shows some issues in union: Demo.
Changing to:
QUESTION
I'm a newbie at GA and I can't seem to find the answer to this question (apologies for any unintended duplicate). I understood what it means to set up a user-id and what's session unification. What I don't really understand is what happens to the non user-id view when the user-id view is created. I mean: it stays there, but does it keep collecting data ignoring the user-id or does it ignore the user-id assigned sessions?
I hope it's an understandable question!
...ANSWER
Answered 2022-Jan-11 at 12:38Nothing happens, the standard view collects sessions normally. In the user-ID view, on the other hand, only hits that contain the user-ID are collected.
QUESTION
I'm trying to learn Isabelle:
...ANSWER
Answered 2021-Oct-22 at 16:05algebra_simps
is a list of common math rules. Adding it solves the problem:
QUESTION
It has been mentioned in Flink docs that DataSet API will be deprecated in future. So I am looking into prototyping this Dataset API to DataStream API in Batch Mode (which I believe is in Beta right now) migration.
We have this(similar) code in our codebase that uses leftOuterJoin on a DataSet.
...ANSWER
Answered 2021-Sep-30 at 17:58The relational operations on DataSets (e.g., joins) are being deprecated in favor of using the relational operations offered by the Table/SQL API, which is fully interoperable with the DataStream API.
See https://ci.apache.org/projects/flink/flink-docs-stable/docs/dev/table/tableapi/#joins and https://ci.apache.org/projects/flink/flink-docs-stable/docs/dev/table/sql/queries/joins/.
You can either use Table connectors and perform a join directly on the tables they produce, or convert datastreams to tables before performing the join. And you can convert from tables back to datastreams if needed for further processing. Given the table/stream duality, these "conversions" don't really cost anything. See https://ci.apache.org/projects/flink/flink-docs-stable/docs/dev/table/data_stream_api/.
FWIW, Flink 1.14 was just released, and it includes a number of improvements related to this topic. In particular, only in 1.14 (and beyond) can you combine the Table API with the DataStream API in batch execution mode.
QUESTION
I've been working on a formalization for a process calculus in Coq (repository here), and constantly find myself trying to apply a function which fails because of equivalent, but syntactically different, subterms. This often happens because of manipulation of de Bruijn variables. As unification fails, I'll usually just replace misbehaving subterms explictly beforehand and then apply the function I need. A simple code as an example of what I mean:
...ANSWER
Answered 2021-Sep-17 at 23:31applys_eq
from Programming Language Foundations' LibTactics will accomplish that. From the documentation (as of Version 6.1 of the book):
applys_eq H
helps proving a goal of the formP x1 .. xN
from an [sic] hypothesisH
that concludesP y1 .. yN
, where the argumentsxi
andyi
may or may not be convertible. Equalities are produced for all arguments that don't unify.The tactic invokes
equates
on all arguments, then callsapplys K
, and attempts reflexivity on the side equalities.
QUESTION
I'm having trouble getting my war file to deploy on application start.
According to the docs here:
The following sample Dockerfile can be used to prepare a custom Payara Server image that deploys the myapplication.war artefact at runtime:
...ANSWER
Answered 2021-Sep-10 at 15:45QUESTION
I'm trying to define a function that takes a set and a relation and returns a bool telling if the relation is reflexive on the set. I tried to define it like this:
...ANSWER
Answered 2021-Jul-14 at 08:00You need to write it such that the value is not prop
in the first place — there's no conversion. In this case, you used the prop-level implication ⟹
between ∀x. x ∈ A
and (x, x) ∈ R
. You may use a single-width arrow -->
instead, which is an implication of bools.
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Install unification
You can use unification like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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