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moments

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Model Perspective
Model Perspective
Jul 29, 2022 · Fundamentals

Unlocking Random Variables: Expectation, Variance, and Higher-Order Moments Explained

This article introduces the key numerical characteristics of random variables—including expectation, variance, covariance, correlation, and higher-order moments such as skewness and kurtosis—explains their definitions, properties, and relationships, and extends these concepts to random vectors and matrix representations.

covariancemomentsprobability
0 likes · 8 min read
Unlocking Random Variables: Expectation, Variance, and Higher-Order Moments Explained
Java Architect Essentials
Java Architect Essentials
Jun 24, 2021 · Operations

Scaling WeChat Moments: Architecture, Capacity Planning, and Flexible Strategies for High Traffic

This article analyzes the large‑scale architecture of WeChat Moments, detailing image and video traffic characteristics, hardware and software safeguards, disaster‑recovery mechanisms, capacity assessment, and a series of flexible strategies such as compression format changes, bitrate reduction, buffer pools, and timeline throttling to handle holiday spikes.

Capacity PlanningFlexible StrategiesWeChat
0 likes · 10 min read
Scaling WeChat Moments: Architecture, Capacity Planning, and Flexible Strategies for High Traffic