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Publish a portfolio dashboard without exposing source data
A portfolio should demonstrate modelling and analysis without releasing data you are not authorized to share. Use an original synthetic dataset or a dataset whose permitted use you have checked, and inspect the complete
PySpark joins: identify skew before changing configuration
Join skew occurs when a few keys hold much more data than others, forcing one partition or task to do disproportionate work. Before changing executor memory or shuffle settings, measure key frequency and inspect the exec
Python comprehensions: readability before cleverness
Use a comprehension when one clear expression transforms or filters a collection. Prefer an ordinary loop when each item requires validation, multiple outcomes or diagnostic records. Shorter code is not automatically eas
Python datetime: distinguish dates, local times and instants
A business date, a wall-clock reading and an instant answer different questions. Store a contract's effective date as a date when time is irrelevant. Store an event with enough timezone information to identify when it ha
Python Decimal for money versus floating-point arithmetic
For monetary calculations that must reconcile to decimal source amounts, use Decimal constructed from validated text or integer minor units. A float remains useful for many statistical calculations, but its binary repres
Python environments: reproduce an analysis on another laptop
A reproducible analysis needs more than a script that ran once. Another reader needs the interpreter and dependency information, the same input data, explicit execution steps and expected results that reveal whether the
Python generators for processing a large file incrementally
A generator yields values as a consumer requests them, which can avoid loading every record into a list. It does not guarantee constant memory: deduplication keys, customer sets, sorting and downstream collections can st
Python lists versus dictionaries in a reporting task
A list preserves an ordered collection of records, including repeated values. A dictionary associates keys with values for keyed access. The choice affects what information survives: building a dictionary from nonunique
Python pathlib: make scripts portable across computers
Use pathlib to express paths as filesystem objects, then decide explicitly what relative paths mean. Replacing backslashes with forward slashes does not by itself make an analysis portable: the working directory, input c
Python type conversion: reject invalid numeric records explicitly
Numeric conversion should follow a source contract. Decide which formats, units and special values are permitted, then reject or quarantine records that do not satisfy it. Turning every conversion failure into zero chang
QLoRA trade-offs: memory savings and evaluation requirements
QLoRA trains low-rank adapters while backpropagating through a frozen quantized base model. Four-bit storage sounds like one quarter of 16-bit weight storage, but that ratio is not total training memory and says nothing
Quantile regression for uncertainty-aware delivery estimates
A mean estimate answers an average question. Operations teams often need a different one: what duration should cover roughly 90% of comparable outcomes? Quantile regression can estimate that conditional percentile direct
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