AI News, Amazon Machine Learning: Use Cases and a Real Example in Python
- On Tuesday, June 5, 2018
- By Read More
Amazon Machine Learning: Use Cases and a Real Example in Python
“Amazon Machine Learning is a service that makes it easy for developers of all skill levels to use machine learning technology.” After using AWS Machine Learning for a few hours I can definitely agree with this definition, although I still feel that too many developers have no idea what they could use machine learning for, as they lack the mathematicalbackground to really grasp its concepts.
HereI would like to share my personal experience with this amazing technology, introduce some of the most important, and sometimes misleading, concepts of machine learning, and givethis new AWS service a try with an open dataset in order to train and use a real-world AWS Machine Learning model.
In my personal experience, the most crucial and time-consuming part of the job is defining the problem and buildinga meaningful dataset, which actually means: The first point may seem trivial, but it turns out that not every problem can be solved with machine learning, even AWS Machine Learning.Therefore, you will need to understand whether your scenario fits or not.
You might decide to discard some input features in advance and somehow, inadvertently, decrease your model’s accuracy.On the other hand, deciding to keep the wrong column might expose your model tooverfitting during thetraining and therefore weaken your new predictions.
If your current dataset mostly contains data about male users, since very few females have signed up, you might end up with an always-negative prediction for every new female user, even though it’s not actually the case.
You will need to adapt their input format to the kind of simple csv file AWS Machine Learning expects and understand how the input features have been computed so that you canactually use the model with your own online data toobtain predictions.
It is freely available here.This dataset contains more than 10,000 records, each defined by 560 features and one manually labeled target column, which can take one of the following values: The 560 features columns are the input data of our model and represent the time and frequency domain variables obtained by the accelerometer and gyroscope signals.
Also, the usual 70/30 dataset split has already been performed by the dataset authors (you will find four files in total), but in our case, AWS Machine Learning will do all of that for us, so we want to upload the whole set as one single csv file.
for example we could add more “standing” recordsto help the model distinguish it from “sitting.” Or we might even find out that our data is wrong or biased by some experimental assumptions, in which case we’ll need to come up with new ideas or solutions to improve the data (i.e.
In this specific case, we would need to sit down and study how those 560 input features have been computed, code the sameinto our mobile app, and then call our AWS Machine Learning model to obtain an online prediction for the given record.
In order to simplify thisdemo, let’s assume that we have already computed the features vector, we’re using python on our server, and we have installed thewell knownboto3 library.
That way, you’ll avoid having to deal with meaningless input names such as “Var001”, “Var002.” In my python script below, I am reading the features record from a local file and generating names based on the column index (you can find the full commented code and the record.csv file here).
While there are a million use cases with datasets unique to a variety of specific contexts, AWS Machine Learning successfully manages the process to allow you to focus just on your data, without wasting your time trying tons of models and dealing with boring math.
At the moment this is quite painful, as you would need to upload a brand new source to S3 and go through the whole training/testing process every time, ending up withN models, N evaluations, and N*3 data sources on your AWS Machine Learning dashboard.
Amazon Machine Learning FAQs
You can use Amazon Machine Learning to read your data from three data stores: (a) one or more files in Amazon S3, (b) results of an Amazon Redshift query, or (c) results of an Amazon Relational Database Service (RDS) query when executed against a database running with the MySQL engine.
Amazon Machine Learning will be able to train ML models and generate accurate predictions in the presence of a small number of both kinds of data errors, enabling your requests to succeed even if some data observations are invalid or incorrect.
To correct incomplete or missing information, you need to return to the master datasource and either correct the data in that source, or exclude the observations with incomplete or missing information from the datasets used to train Amazon Machine Learning models.
You can also use Amazon Machine Learning to ensure that the model evaluation is unbiased by choosing to withhold a part of the training data for evaluation purposes, ensuring that the model is never evaluated with data points that were seen at the training time.
Adding more observations, adding additional types of information (features), and transforming your data to optimize the learning process (feature engineering) are all great ways to improve the model’s predictive accuracy.
Additionally, Amazon Machine Learning can automatically create a suggested data transformation recipe based on your data when you create a new datasource object pointing to your data—this recipe will be automatically optimized based on your data contents.
Amazon Machine Learning also provides several parameters for tuning the learning process: (a) target size of the model, (b) the number of passes to be made over the data, and (c) the type and amount of regularization to apply to the model.
For example, some applications are very tolerant of false positive errors, but false negative errors are highly undesirable—the Amazon Machine Learning service console helps you adjust the score cut-off to align with this requirement.
Amazon Machine Learning Product Details
Amazon Machine Learning is a managed service for building ML models and generating predictions, enabling the development of robust, scalable smart applications.
Amazon Machine Learning combines powerful machine learning algorithms with interactive visual tools to guide you towards easily creating, evaluating, and deploying machine learning models.
Once a model is built, the service's intuitive model evaluation and fine-tuning console help you understand its strengths and weaknesses, and adjust its performance to meet business objectives.
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