The latest Raspberry Pi 4 comes with an option of 4G ram. This truly makes the Raspberry Pi a workable personal portable computer. However, the temperature could go pretty high when it is implementing intensive tasks. The simplest solution would be adding a fan to cool it down, but it makes no sense to let the fan running all the time.

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The following notes are under the official Raspbian system.

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Anomaly Detection (a.k.a Outlier Detection) is a process of detecting unexpected observations in specified datasets.

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Censorships in data is a condition in which the value of a measurement or observation is only partially observed. Censored data is one kind of missing data, but is different from the common meaning of missing value in machine learning. We usually observe censored data in a time-based dataset. In such datasets, the event is been cut off beyond a certain time boundary. We can apply survival analysis to overcome the censorship in the data.

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Unlike Decision Tree Classifier, some machine learning models doesn't have the ability to deal with categorical data. The categorical data are often requires a certain transformation technique if we want to include them, namely Label Encoding and One-Hot Encoding.

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Imbalanced datasets are a common problem in classification tasks in machine learning. Take credit card fraud prediction as a simple example: the target values are either fraud (1) or not fraud (0), but the number of fraud (1) could only be less than one percent of the whole dataset.

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MSE stands for mean squared error, MAE stands for mean absolute error. These are commonly used measurement in modelling.

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To log some useful Nginx Server Configurations.

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Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. It is so far the best way to connect with your servers. GitHub also allows SSH with secure connection.

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