coursera scala

, i.e., all of our training examples lie perfectly on some straigh T line. If J (θ0,θ1) =0, that means the line defined by the equation "y=θ0+θ1x" perfectly fits all of our data. For the To is true, we must has Y (i) =0 for every value of i=1,2,..., m. So long as any of our training examples lie on a straight line, we'll be able to findθ0 andθ1 so, J (θ0,θ1) =0. It is not a necessary that Y (i) =0 for all of our examples. We can perfectly predict the value o

-Learning RateIn the gradient descent algorithm, the number of iterations required for the algorithm convergence varies according to the model. Since we cannot predict in advance, we can plot the corresponding graphs of iteration times and cost functions to observe when the algorithm tends to converge.Of course, there are some ways to automatically detect convergence, for example, we compare the change value of a cost function with a predetermined threshold, such as 0.001, to determine convergen

-Gradient descent for linear regressionHere we apply the gradient descent algorithm to the linear regression model, we first review the gradient descent algorithm and the linear regression model:We then expand the slope of the gradient descent algorithm to the partial derivative:In most cases, the linear regression model cost function is shaped like a convex body, so the local minimum value is equivalent to the global minimum:The following is the entire convergence and parameter determination pr

-Gradient descentThe gradient descent algorithm is an algorithm for calculating the minimum value of a function, and here we will use the gradient descent algorithm to find the minimum value of the cost function.The idea of a gradient descent is that we randomly select a combination of parameters and calculate the cost function at the beginning, and then we look for the next combination of parameters that will reduce the value of the cost function.We continue this process until a local minimum (

(x.next[c], key, d+1); the returnx; * } $ Panax Notoginseng Public Booleancontains (String key) - { theNode x = Get (root, key, 0); + if(x = =NULL)return false; A returnX.hasword; the } + - PrivateNode get (node X, String key,intd) $ { $ if(x = =NULL)return NULL; - if(d = = Key.length ())returnx; - intc =charAt (key, D); the returnGet (X.next[c], key, d+1); - }Wuyi the Public BooleanHaskeyswi

use of MATLAB. *.4.gradientdescent.mfunction [Theta, j_history] =gradientdescent (X, y, theta, Alpha, num_iters)%gradientdescent performs gradient descent to learn theta% theta = gradientdescent (X, y, theta, Alpha, num_iters) up Dates theta by% taking num_iters gradient steps with learning rate alpha% Initialize Some useful valuesm= Length (y);%Number of training examplesj_history= Zeros (Num_iters,1); forITER =1: Num_iters% ====================== YOUR CODE here ======================% instru

Overview photo OCR problem Description and Pipeline sliding Windows getting Lots of data and Artificial data ceiling analysis:what part of the Pipeline to work on Next Review Lecture Slides Quiz:Application:Photo OCR Conclusion Summary and Thank You Log 4/20/2017:1.1, 1.2; Note Ocr? ... Coursera-machine Learning, Stanford:w

I've been procrastinating for the last time, and I'm going to keep it up today. Programming Title #: Calculating the sum of the edge elements of a matrix Source: POJ (Coursera statement: The exercises completed on POJ will not be counted into Coursera's final results. ) Note: Total time limit: 1000ms memory limit: 65536kB description Enter an integer matrix to compute the sum of elements at the edge of the matrix. The elements of the so-called matrix

Week 3 Quizhelp Center Warning:the hard deadline has passed. You can attempt it, but and you won't be. You are are welcome to try it as a learning exercise. In accordance with the Coursera Honor Code, I certify this answers here are I own work. Question 1 Assume you are using a Unigram language model to calculate the probabilities of phrases. Then, the probabilities of generating the phrases "study text mining" and "text mining study" are not equal, i

Week 3 Practice quizhelp Center Warning:the hard deadline has passed. You can attempt it, but and you won't be. You are are welcome to try it as a learning exercise. In accordance with the Coursera Honor Code, I certify this answers here are I own work. Question 1 are given a vocabulary composed of only three words: "text", "mining", and "the". Below are the probabilities of two of this three words given by a Unigram model: Word Probability Text 0.4 M

Build a scala environment in linux and write a simple scala Program (Code tutorial), linuxscala Installing the scala environment in linux is very simple. If it is a ubuntu environment, it will be simpler. You can directly use apt-get to solve the problem. I just use ubuntu. java/scala systems must be based on jdk, so

Scala details --------- installation and configuration problems, scala ---------Install Scala 2.11 In Win7 1. Download Scala 2.11Http://download.csdn.net/download/u014393736/7107595 The Scala Installation File I downloaded is actually a compressed package. You only need to d

Implicit references (implicit Import)Scala automatically adds several implicit references to each program, just as the Java program automatically adds a Java.lang package. In Scala, the contents of the following three packages are implicitly referenced to each program. The difference is that Scala also implicitly adds a reference to the Predef, which greatly faci

Class level for 1.ScalaThe top of the class in Scala is any class that inherits any classes, and any includes the following common methods:Final def == =(That:any): Boolean def equals (That:any): Boolean def hashcode:int def tostring:string2 operator overloads, one Equals method, one Hashcode method and one tostring method.Root class any has two sub-classes: Anyval and AnyrefAnyval is the parent of a value type, and Anyref is the parent class of the r

Why do you write this blog?First of all, for the Spark project, it is highly recommended to build, with IntelliJ idea (Ultimate version), if you have another hobby to try Scala ideas for Eclipse, have time to play for yourself. But it's best to follow the crowd.For Hadoop projects, Eclipse is strongly recommended.Second, out of a Bo friends to give me the need to leave a message, in order to more efficient and high-quality help everyone, comb write do

I haven't been to Scala official website for a long time. I accidentally opened the browser bookmarks tonight and found the article "Scala-Teaching O-O" on the home page, and the Updated is just Updated yesterday: 2010-10-18 ,), And the title is quite attractive. Yann, Assistant Professor in Paris, chose Scala and Simply

First, Scala is the combination of functional programming and object-oriented programming language, what are the characteristics of these two programming? A: Functional programming excels at numerical calculations, and object-oriented programming is particularly well suited for large engineering or project organizations, and for team collaboration.Second, Scala the characteristicsScala elegant structure, so

The victory and defeat of the military are not in the future, and the shame of the bag is the male-douniu fighting, fighting, fighting... It has been some time since I learned and used scala. At first, I learned scala mainly to learn the spark ecosystem. But after learning some scala features, I was deeply impressed by scala