Machine learning for multi

Unlike normal regression where a single value is predicted for each sample, multi-output regression requires specialized machine learning algorithms that support outputting multiple variables for each prediction.

Deep learning neural networks are an example of an algorithm that natively supports multi-output regression problems. Neural network models for multi-output regression tasks can be easily defined and evaluated using the Keras deep learning library. In this tutorial, you will discover how to develop deep learning models for multi-output regression.

machine learning for multi

Regression is a predictive modeling task that involves predicting a numerical output given some input. Typically, a regression task involves predicting a single numeric value. Although, some tasks require predicting more than one numeric value. These tasks are referred to as multiple-output regressionor multi-output regression for short. In multi-output regression, two or more outputs are required for each input sample, and the outputs are required simultaneously.

The assumption is that the outputs are a function of the inputs. Our dataset will have 1, samples with 10 input features, five of which will be relevant to the output and five of which will be redundant. The dataset will have three numeric outputs for each sample. The complete example of creating and summarizing the synthetic multi-output regression dataset is listed below. Running the example creates the dataset and summarizes the shape of the input and output elements.

We can see that, as expected, there are 1, samples, each with 10 input features and three output features. Popular examples are decision trees and ensembles of decision trees. A limitation of decision trees for multi-output regression is that the relationships between inputs and outputs can be blocky or highly structured based on the training data.

Neural network models also support multi-output regression and have the benefit of learning a continuous function that can model a more graceful relationship between changes in input and output.

Multi-output regression can be supported directly by neural networks simply by specifying the number of target variables there are in the problem as the number of nodes in the output layer. For example, a task that has three output variables will require a neural network output layer with three nodes in the output layer, each with the linear default activation function.Many computationally expensive tasks for machine learning can be made parallel by splitting the work across multiple CPU coresreferred to as multi-core processing.

Common machine learning tasks that can be made parallel include training models like ensembles of decision trees, evaluating models using resampling procedures like k-fold cross-validation, and tuning model hyperparameters, such as grid and random search. Using multiple cores for common machine learning tasks can dramatically decrease the execution time as a factor of the number of cores available on your system. A common laptop and desktop computer may have 2, 4, or 8 cores.

Larger server systems may have 32, 64, or more cores available, allowing machine learning tasks that take hours to be completed in minutes.

In this tutorial, you will discover how to configure scikit-learn for multi-core machine learning. For example, evaluating machine learning models using a resampling technique like k-fold cross-validation requires that the training process is repeated multiple times.

Tuning model hyperparameters compounds this further as it requires the evaluation procedure repeated for each combination of hyperparameters tested. Most, if not all, modern computers have multi-core CPUs. This includes your workstation, your laptop, as well as larger servers.

You can configure your machine learning models to harness multiple cores of your computer, dramatically speeding up computationally expensive operations. This configuration argument allows you to specify the number of cores to use for the task.

machine learning for multi

The default is None, which will use a single core. You can also specify a number of cores as an integer, such as 1 or 2. Finally, you can specify -1, in which case the task will use all of the cores available on your system. Each core may also have hyper-threadinga technology that under many circumstances allows you to double the number of cores.

For example, my workstation has four physical cores, which are doubled to eight cores due to hyper-threading. Therefore, I can experiment with cores or specify -1 to use all cores on my workstation. You will get different timings for all of the examples in this tutorial; share your results in the comments. You may also need to change the number of cores to match the number of cores on your system. We are not profiling the code examples per se; instead, I want you to focus on how and when to use the multi-core capabilities of scikit-learn and that they offer real benefits.

I wanted the code examples to be clean and simple to read, even for beginners. I set it as an extension to update all examples to use the timeit API and get more accurate timings. Share your results in the comments. This affects not just the training of the model, but also the use of the model when making predictions. A popular example is the ensemble of decision trees, such as bagged decision trees, random forest, and gradient boosting.

In this section we will explore accelerating the training of a RandomForestClassifier model using multiple cores. We will use a synthetic classification task for our experiments.

In this case, we will define a random forest model with trees and use a single core to train the model. We can record the time before and after the call to the train function using the time function. We can then subtract the start time from the end time and report the execution time in the number of seconds. The complete example of evaluating the execution time of training a random forest model with a single core is listed below.

We can now change the example to use all of the physical cores on the system, in this case, four. We can now change the number of cores to eight to account for the hyper-threading supported by the four physical cores. In this case, we can see that we got another drop in execution speed from about 3.Machine learning is a large field of study that overlaps with and inherits ideas from many related fields such as artificial intelligence.

The focus of the field is learning, that is, acquiring skills or knowledge from experience. Most commonly, this means synthesizing useful concepts from historical data. As such, there are many different types of learning that you may encounter as a practitioner in the field of machine learning: from whole fields of study to specific techniques.

In this post, you will discover a gentle introduction to the different types of learning that you may encounter in the field of machine learning. There are perhaps 14 types of learning that you must be familiar with as a machine learning practitioner; they are:. Did I miss an important type of learning? Let me know in the comments below.

First, we will take a closer look at three main types of learning problems in machine learning: supervised, unsupervised, and reinforcement learning. Supervised learning describes a class of problem that involves using a model to learn a mapping between input examples and the target variable.

Applications in which the training data comprises examples of the input vectors along with their corresponding target vectors are known as supervised learning problems. Models are fit on training data comprised of inputs and outputs and used to make predictions on test sets where only the inputs are provided and the outputs from the model are compared to the withheld target variables and used to estimate the skill of the model.

Learning is a search through the space of possible hypotheses for one that will perform well, even on new examples beyond the training set. To measure the accuracy of a hypothesis we give it a test set of examples that are distinct from the training set.

Multiclass classification

There are two main types of supervised learning problems: they are classification that involves predicting a class label and regression that involves predicting a numerical value. Both classification and regression problems may have one or more input variables and input variables may be any data type, such as numerical or categorical.

An example of a classification problem would be the MNIST handwritten digits dataset where the inputs are images of handwritten digits pixel data and the output is a class label for what digit the image represents numbers 0 to 9. An example of a regression problem would be the Boston house prices dataset where the inputs are variables that describe a neighborhood and the output is a house price in dollars. Popular examples include: decision treessupport vector machinesand many more.

Our goal is to find a useful approximation f x to the function f x that underlies the predictive relationship between the inputs and outputs. The term supervised learning originates from the view of the target y being provided by an instructor or teacher who shows the machine learning system what to do.

Some algorithms may be specifically designed for classification such as logistic regression or regression such as linear regression and some may be used for both types of problems with minor modifications such as artificial neural networks. Unsupervised learning describes a class of problems that involves using a model to describe or extract relationships in data. Compared to supervised learning, unsupervised learning operates upon only the input data without outputs or target variables.

As such, unsupervised learning does not have a teacher correcting the model, as in the case of supervised learning.

In unsupervised learning, there is no instructor or teacher, and the algorithm must learn to make sense of the data without this guide. There are many types of unsupervised learning, although there are two main problems that are often encountered by a practitioner: they are clustering that involves finding groups in the data and density estimation that involves summarizing the distribution of data.

An example of a clustering algorithm is k-Means where k refers to the number of clusters to discover in the data. An example of a density estimation algorithm is Kernel Density Estimation that involves using small groups of closely related data samples to estimate the distribution for new points in the problem space. The most common unsupervised learning task is clustering: detecting potentially useful clusters of input examples.

Additional unsupervised methods may also be used, such as visualization that involves graphing or plotting data in different ways and projection methods that involves reducing the dimensionality of the data. An example of a visualization technique would be a scatter plot matrix that creates one scatter plot of each pair of variables in the dataset.With heterogeneous IT landscapes — a mix of legacy and cloud residing environments — and the growing IoT reality due to the rise in sensor devices, networks and IT infrastructures are becoming increasingly complex.

Securing these more complicated and complex networks requires machine learning and security platforms that can reach across multi-platform data environments. Detecting threats and learning from previous ones will drive cybersecurity towards a proactive approach regardless of where the data is stored. The skills and technologies needed to accomplish this are available. Adopting a forward-looking approach is essential for government agencies and organizations.

Putting the best personnel, technologies, and methods on the task of safeguarding multi-strata data is critical. Nasheb is a published author with more than ten years of experience in streaming analytic initiatives and cyber intrusion detection within the public sector.

Moreover, administrators will have the added responsibility of understanding the complexities and restrictions across every security and governance toolset in each environment. The burden of keeping these tools in sync at all times further increases the risk of human error and noncompliance.

How does IoT create additional complexities when thinking about security? Implementing a single view of security across all these devices is difficult. We also have to deal with the veracity and the validity of the data in streaming architectures. This means understanding if the data has been maliciously transformed in any way and if the data is coming in the correct order. What makes this challenge unique in the public sphere? In the long term, your data and workloads are all migrated to take advantage of more efficient architectures and software design methodologies, like Kubernetes.

The sensitivity, classification, and compliance requirements of the data provide a unique challenge to the public sector. For instance, certain sensitive datasets are not permitted to be moved to the cloud from on-premises environments. In this case, you would implement a hybrid solution where sensitive data and workloads remain on-premises, and non-sensitive workloads move to the cloud. What does triage look like in these settings? This centralized view enables the deployment of security controls with easy data, metadata, policy, and governance migration between cloud environments.

What are the benefits? Here we can leverage Machine Learning to detect and visualize anomalous patterns in our data. We can then implement the machine learning models back into the stream enabling us to detect anomalies as they appear in real-time. How are new technologies helping government agencies better monitor, manage and protect these complex, complicated IT environments?

Giving cybersecurity professionals a single pane of glass in which to manage hybrid-cloud environments, administer cloud and on-premises resources, and maintain users and their access dramatically reduces organizational overhead, security risks, and noncompliance.

Then there is a new generation of Big Data and data analytics tools that are enabling agencies to collect, curate, enrich, and transform all types of data for immediate analysis. These tools deliver key insights to government cybersecurity professionals in real-time without having to write a single line of code. And they also are essential for delivering the insights and data necessary for embracing artificial intelligence and machine learning solutions to help advance cybersecurity programs and identify threats.

Can you describe what is meant by machine learning? And, how does machine learning help security within government agencies? Machine learning has many security applications, including detecting malware in encrypted traffic and finding insider threats by analyzing log data for patterns.

These machine learning models can then be deployed back into the source and stream to detect real-time threats. This capability is known as predictive analytics. For example, Cloudera recently worked with a government agency to utilize its predictive analytics platform to implement a log ingestion pipeline. This pipeline leverages behavior analytics-based machine learning to profile and detect potential advanced persistent threats within their network, in real-time.

This is essential since advanced persistent threats remain one of the largest and impactful security risks threatening government networks today.

View All Events. Why machine learning is the right approach for securing multi-platform data environments. GovCybersecurityHub Editors.Being able to predict the future is awesome. You might want to predict how well a stock will do based on some other information that you just happen to have. Multiple linear regression might be for you!

Multiple linear regression is fun because it looks at the relationships within a bunch of information. Instead of just looking at how one thing relates to another thing simple linear regressionyou can look at the relationship between a lot of different things and the thing you want to predict. It can use several variables to predict the outcome of a different variable. The goal of multiple regression is to model the linear relationship between your independent variables and your dependent variable.

Why machine learning is the right approach for securing multi-platform data environments

It looks at how multiple independent variables are related to a dependent variable. It will give you a quick and fun walk-through of the basics. Simple linear regression is what you can use when you have one independent variable and one dependent variable.

machine learning for multi

Multiple linear regression is what you can use when you have a bunch of different independent variables! Multiple regression analysis has three main uses. I do want you to know that things can get a lot more complex than this in the real world. For the purposes of this post, you are now working for a venture capitalist. You need to inform the guy who hired you what kind of companies will make the most sense in the future to invest in.

This means that the profits column is your dependent variable. The other columns are the independent variables. So you want to learn about the dependent variable profit based on the other categories of information you have. He wants to use the information in this dataset as a sample.

This sample will help him understand which of the companies he looks at in the future will perform better based on the same information. Does he want to invest in companies that are based in Illinois? You need to help him create a set of guidelines. Linear regression is great for correlation, but remember that correlation and causation are not the same things!In machine learningmulticlass or multinomial classification is the problem of classifying instances into one of three or more classes classifying instances into one of two classes is called binary classification.

While many classification algorithms notably multinomial logistic regression naturally permit the use of more than two classes, some are by nature binary algorithms; these can, however, be turned into multinomial classifiers by a variety of strategies. Multiclass classification should not be confused with multi-label classificationwhere multiple labels are to be predicted for each instance.

The existing multi-class classification techniques can be categorized into i transformation to binary ii extension from binary and iii hierarchical classification. This section discusses strategies for reducing the problem of multiclass classification to multiple binary classification problems.

It can be categorized into one vs rest and one vs one. The techniques developed based on reducing the multi-class problem into multiple binary problems can also be called problem transformation techniques. This strategy requires the base classifiers to produce a real-valued confidence score for its decision, rather than just a class label; discrete class labels alone can lead to ambiguities, where multiple classes are predicted for a single sample. In pseudocode, the training algorithm for an OvR learner constructed from a binary classification learner L is as follows:.

Making decisions means applying all classifiers to an unseen sample x and predicting the label k for which the corresponding classifier reports the highest confidence score:. Although this strategy is popular, it is a heuristic that suffers from several problems.

The Complete Beginner’s Guide to Machine Learning: Multiple Linear Regression in 4 Lines of Code!

Firstly, the scale of the confidence values may differ between the binary classifiers. Second, even if the class distribution is balanced in the training set, the binary classification learners see unbalanced distributions because typically the set of negatives they see is much larger than the set of positives. In the one-vs. Like OvR, OvO suffers from ambiguities in that some regions of its input space may receive the same number of votes.

This section discusses strategies of extending the existing binary classifiers to solve multi-class classification problems. Several algorithms have been developed based on neural networksdecision treesk-nearest neighborsnaive Bayessupport vector machines and extreme learning machines to address multi-class classification problems. These types of techniques can also be called algorithm adaptation techniques.

Multiclass perceptrons provide a natural extension to the multi-class problem. Instead of just having one neuron in the output layer, with binary output, one could have N binary neurons leading to multi-class classification.

In practice, the last layer of a neural network is usually a softmax function layer, which is the algebraic simplification of N logistic classifiers, normalized per class by the sum of the N-1 other logistic classifiers. Extreme learning machines ELM is a special case of single hidden layer feed-forward neural networks SLFNs where in the input weights and the hidden node biases can be chosen at random. Many variants and developments are made to the ELM for multiclass classification.

To classify an unknown example, the distance from that example to every other training example is measured. The k smallest distances are identified, and the most represented class by these k nearest neighbours is considered the output class label. Naive Bayes is a successful classifier based upon the principle of maximum a posteriori MAP. This approach is naturally extensible to the case of having more than two classes, and was shown to perform well in spite of the underlying simplifying assumption of conditional independence.

Decision tree learning is a powerful classification technique. The tree tries to infer a split of the training data based on the values of the available features to produce a good generalization. The algorithm can naturally handle binary or multiclass classification problems.

The leaf nodes can refer to any of the K classes concerned. Support vector machines are based upon the idea of maximizing the margin i.With more than 800 million monthly visitors, YouTube is an effective online venue to market your business. In order to successfully do this, you have to go beyond just posting product videos or sharing your random thoughts. Be focused and determined with your message. Although you can spend thousands of dollars on high-tech cameras, editing software, and lighting equipment, your smartphone camera is good enough to capture a video that will do the trick.

Online Marketing Goal: This free online marketing strategy will capture the attention of the video market. Online businesses usually want to get high-profile celebrities to endorse them. Rather than trying to get a mega star to endorse how wonderful your business is, look for a local celebrity.

Since they live within your neighborhood or city, it will be easier to make contact with them over the telephone or personally. When you contact your local celebrity, tell them you want to send them a gift that will make their life easier.

Then send them a sample of your service or product. Online Marketing Goal: Use this method to get exposure in your local market. With any business, online or off, it is a good strategy to market yourself close to home. Later, or at the same time, you can use other methods provided to reach your global market. For example, Amazon is a platform you can use for free and they only take a certain percentage of the sale price every time someone buys your book.

To promote it, you can use your existing email list, social media accounts, and online marketing strategies listed here. To get more leads, you should know that Amazon provides your prospective buyers with a sneak peek of the first couple of pages of your e-book. So you need to make sure you embed links in these pages so you will be able to capture leads, for when prospective buyers decide not to buy your e-book.

10.4: Neural Networks: Multilayer Perceptron Part 1 - The Nature of Code

Online Marketing Goal: Your goal with this free online marketing strategy is to use your e-book as a way to get leads. Use it to direct readers to your website where they can opt-in and get more information and tips on your industry topic. Find at least three blogs that target your ideal target market and contact the blog owner.

Give them a couple of suggestions on how you can add value to their readership. Online Marketing Goal: To expand your audience.

machine learning for multi

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