Researchers have unearthed how human brains inherently perform calculations akin to high-powered computers through Bayesian inference, enabling precise, swift environmental interpretation.
This advancement could significantly improve the interface between humans and smart technologies.
For a person new to Linux, finding Linux functional is still not very easy even after the emergence of user friendly Linux distro like Ubuntu and Mint.
Valerie Glassborow (pictured top right) was one of the 9,000 people who worked at Bletchley Park in Milton Keynes during WW2.
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The series about coding with Scratch concludes with an advanced lesson in recursion, opening the door to the mysterious yet ultimately logical world of fractals.
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If the past 12 months have you feeling like you're stuck in the beta version of some giant, buggy simulation, we're right there with you, what with the World Series, the Super Bowl, the Oscars, and depending on which side of the fence you sit, the US...
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It's clear that technology is constantly advancing, and computers (artificial intelligence) are doing many new things. This affects many jobs, bookkeepers included. In this video, I share all of the statistics I found about "robot bookkeepers" and the data on how advancements are actually
*IBM отмечает одни из самых важных проблем IT-инфраструктур современности Несколько дней назад компания IBM анонсировала начало «новой, упрощенной эры вычислен...
Overview of C++'s standard sequence
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Researchers demonstrate the viability of direct brain-to-brain communication in humans located over 5000 miles apart.
What is Confusion Matrix and Advanced Classification Metrics? After data preparation and model training, there is model evaluation phase which I mentioned in my earlier article Simple Picture of Machine Learning Modelling Process. Once model is developed, the next phase is to calculate the performance of the developed model using some evaluation metrics. In this article, you will just discover about confusion matrix though there are many classification metrics out there. Mainly, it focuses on below points: What is confusion matrix? Four outputs in confusion matrix Advanced classification metrics Table 1. Confusion matrix with advanced classification metrics Confusion Matrix is a tool to determine the performance of classifier. It contains information about actual and predicted classifications. The below table shows confusion matrix of two-class, spam and non-spam classifier. Table 2. Confusion matrix of email classification Let’s understand four outputs in confusion matrix. 1. True Positive (TP) is the number of correct predictions that an example is positive which means positive class correctly identified as positive. Example: Given class is spam and the classifier has been correctly predicted it as spam. 2. False Negative (FN) is the number of incorrect predictions that an example is negative which means positive class incorrectly identified as negative. Example: Given class is spam however, the classifier has been incorrectly predicted it as non-spam. 3. False positive (FP) is the number of incorrect predictions that an example is positive which means negative class incorrectly identified as positive. Example: Given class is non-spam however, the classifier has been incorrectly predicted it as spam. 4. True Negative (TN) is the number of correct predictions that an example is negative which means negative class correctly identified as negative. Example: Given class is spam and the classifier has been correctly predicted it as negative. Now, let’s see some advanced classification metrics based on confusion matrix. These metrics are mathematically expressed in Table 1 with example of email classification, shown in Table 2. Classification problem has spam and non-spam classes and dataset contains 100 examples, 65 are Spams and 35 are non-spams. Sensitivity is also referred as True Positive Rate or Recall. It is measure of positive examples labeled as positive by classifier. It should be higher. For instance, proportion of emails which are spam among all spam emails. Table 3. Sensitivity in confusion matrix Sensitivity = 45/(45+20) = 69.23% . The 69.23% spam emails are correctly classified and excluded from all non-spam emails. Specificity is also know as True Negative Rate. It is measure of negative examples labeled as negative by classifier. There should be high specificity. For instance, proportion of emails which are non-spam among all non-spam emails. Table 4. Specificity in confusion matrix specificity = 30/(30+5) = 85.71% . The 85.71% non-spam emails are accurately classified and excluded from all spam emails. Precision is ratio of total number of correctly classified positive examples and the total number of predicted positive examples. It shows correctness achieved in positive prediction. Table 5. Precision in confusion matrix Precision = 45/(45+5)= 90% The 90% of examples are classified as spam are actually spam. Accuracy is the proportion of the total number of predictions that are correct. Table 6. Accuracy in confusion matrix Accuracy = (45+30)/(45+20+5+30) = 75% The 75% of examples are correctly classified by the classifier. F1 score is a weighted average of the recall (sensitivity) and precision. F1 score might be good choice when you seek to balance between Precision and Recall. It helps to compute recall and precision in one equation so that the problem to distinguish the models with low recall and high precision or vice versa could be solved. Kindly follow my blog by email and stay tuned for more advanced post on regression measures. Thank you!
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So many times I have been asked for help with a query, where the question really comes down to the understanding of the difference between INNER and LEFT or RIGHT JOINs. I created this poster a few years ago and … MySQL JOIN Types Poster Read More »
7-S framework invented by Tom Peters is a must-have business tool in the toolkit of top manager. Learn what it is and how to use it with the Balanced Scorecard.
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Meet ChatGPT, the future of AI assistants! Get ready for a revolutionary experience with its advanced capabilities and natural language understanding. In today’s fast-paced world, artificial…