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Lag features for tree-based forecasting
Tree estimators expect rows and columns, so a time series must be expressed as features available before each target. Common choices include the previous observation, the same period last season and rolling summaries of
Law of large numbers versus central limit theorem
The law of large numbers concerns the sample mean becoming close to the population mean under suitable assumptions. The central limit theorem concerns the limiting distribution of the mean's appropriately standardized er
Lead a blameless review of an integration incident
Blameless does not mean vague. A useful review is precise about impact, timeline, decisions and system conditions while avoiding the fiction that one person’s mistake is the root cause.
Leading versus lagging indicators in an operating review
A lagging indicator summarizes an outcome that has already occurred. A proposed leading indicator is measured earlier and may help anticipate that outcome or guide an action. Being available early does not prove that a m
Learning curves: decide whether more data may help
A learning curve compares model performance as training-set size changes. It can reveal whether a method is still improving over the observed range, whether its training-validation gap is shrinking, and how sensitive a c
LightGBM categorical features: verify the encoding assumptions
Categorical support works only when training and prediction agree on what each value means. A category's integer code is an implementation detail, not a stable identity unless your workflow preserves the mapping.
Likelihood versus probability in a fitted model
Probability fixes a model and asks about possible observations. Likelihood fixes the observations and compares candidate model parameters. The same expression can serve both purposes, but changing what is held fixed chan
Linear regression with residual checks and a naive baseline
A linear regression can improve on a naive baseline and still miss important structure. Evaluate both predictive error and residual behavior before concluding that the fitted relationship adequately represents the task.
Linux permissions for a deployed application
File permissions should match the service identity and operation. Making a secret world-readable to fix one error creates a larger one.
Load-test a prediction API with realistic payloads
A useful load test reflects payload sizes, validity mix, concurrency and arrival patterns expected in operation. It reports throughput, latency distribution and error codes under a defined environment. Calling a predicti
Load-test an AI workflow with realistic failure rates
A throughput test with perfect dependencies measures the least interesting condition. AI workloads face rate limits, long tails, malformed outputs and retries that amplify pressure. Load testing should reveal whether the
Log transformations: interpret predictions on the original scale
Exponentiating a prediction on the log scale does not generally recover the conditional mean on the original scale. The nonlinear transformation makes the target statistic matter.
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