• micro-optimize online sampling

Full Changelog: 0.26.0...0.26.1

qsv-stats 0.26.0 Release Notes

Performance Improvements

• Extensive use of unwrap_unchecked in performance-critical paths where unwrap is guaranteed safe
• Optimized OnlineStats::merge() with early returns and cached totals
• Improved vector preallocation in modes_on_sorted using square root of size instead of size/3
• Removed unneeded nightly optimization features in favor of more targeted performance improvements

Code Quality

• Bumped Minimum Supported Rust Version (MSRV) to latest Rust stable (1.84)
• Refactored modes_on_sorted:
  • Added early return on empty iterator
  • Improved vector preallocation strategy
• Enhanced Commute implementation for Unsorted merge with early returns
• Optimized OnlineStats merge operation with better caching
• Suppressed clippy::cast_sign_loss warnings where appropriate

Documentation

• Added detailed note about modes() function returning all modes with the same frequency
• Improved formatting of documentation comments
• Added clarifying comments about relationship between mode() and modes() functions
• Added test coverage for least_frequent() function

Internal Changes

• Multiple performance-focused refactors using unwrap_unchecked in hot loops
• Better error handling with early returns in several key functions
• Code cleanup and documentation improvements throughout

qsv-stats 0.25.0 Release Notes

Performance Improvements

• Optimized median calculation with improved bounds checking
• Refactored antimodes calculation for better efficiency and memory usage
• Added #[inline] attributes to frequently called functions:
  • stddev()
  • variance()
  • mean()

Code Quality

• Complete rewrite of antimodes_on_sorted implementation
  • More efficient memory usage
  • Better handling of edge cases
  • Clearer code organization
• Enhanced safety with additional code comments explaining unsafe operations
• Improved bounds checking in median calculations

Documentation

• Added clarifying documentation for antimodes behavior (only returns first 10 antimodes)
• Added safety comments explaining numeric conversions
• Improved code readability with detailed comments explaining algorithmic steps

Internal Changes

• Fully qualified std::fmt usage in debug assertions
• Simplified frequency increment checks using is_some_and
• Applied rustfmt formatting
• Removed unnecessary imports

Usage

Add to your Cargo.toml:

[dependencies]
qsv-stats = "0.25"

Full Changelog: 0.24.0...0.25.0

qsv-stats 0.24.0 Release Notes

Documentation Changes

• Clarified MAD as "Median Absolute Deviation" in code documentation
• Updated documentation to reflect that qsv-stats can be used independently of qsv
• Added deeplink to qsv stats command in README
• Improved README clarity and organization
• Added repository header

Organizational Changes

• Repository moved to datHere GitHub organization
  • Updated homepage and repository URLs in Cargo.toml

Performance Improvements

• Optimized means calculation with single-pass updates
• Improved performance of statistics calculation using fused multiply-add operations
• Reordered Unsorted struct fields for better performance (sorted flag first)
• Reduced initial allocation size for modes from 10,000 to 1,000 items for better memory usage

Code Quality

• Removed unwrap() calls in favor of more robust error handling
• Refactored means sampling implementation
• Improved code organization and documentation
• Enhanced safety with better error propagation

Internal Changes

• Combined harmonic and geometric mean updates into a single match statement
• Simplified delta calculations in online statistics
• Cleaned up unnecessary comments

Usage

Add to your Cargo.toml:

[dependencies]
qsv-stats = "0.24"

qsv-stats 0.23.0 Release Notes

New Features

• Added geometric mean calculation support
• Added harmonic mean calculation support

Performance Improvements

• Removed unnecessary bounds checks in median calculation on sorted data
• Optimized quartiles calculation on sorted data
• Reduced initial frequency map capacity from 10k to 1k for better memory usage
• Added several performance-oriented frequency calculation helpers:
  • Added fast path for incrementing existing frequency values
  • Added optimized methods for frequency analysis without full sorting
  • Added efficient top_n() and bottom_n() methods for frequency counts

Code Quality

• Updated minimum supported Rust version (MSRV) to 1.83
• Fixed various Clippy warnings:
  • Removed unnecessary map_or usage
  • Applied suggested if_not_else patterns
  • Added const qualifiers where appropriate
  • Fixed option_if_else patterns
  • Improved other miscellaneous Clippy suggestions

Internal Changes

• Refactored frequency sampling implementation
• Added additional frequency helper methods:
  • items_with_count()
  • total_count()
  • has_count()
• Improved code organization and documentation

Dependencies

• No breaking changes to external dependencies

• added parallel processing option to cardinality

Full Changelog: 0.21.0...0.22.0

Refactored cardinality computation

• allow inline(always)
• use PartialEq instead of Eq trait so we can handle floats
• add sorted parm to cardinality so we can skip sorting if the data is already sorted
• added already_sorted helper
• instead of using dedup, we just doing a loop checking for unique_counts, without doing the other things that dedup does (i.e. removing dupes, so we check len afterwards to get cardinality), making it faster.
• added several tests exercising cardinality

Full Changelog: 0.20.0...0.21.0

• optimize minmax.rs - modes and antimodes calculation
• micro-optimize online.rs - streaming stats calculations
• added more early returns on empty datasets
• optimize merge of minmax.rs to avoid unnecessary allocation by using std::mem::take

Full Changelog: 0.19.1...0.20.0

• minor microoptimizations
• bump MSRV to 1.81 as there are new improve sort algorithms that we can take advantage of

Full Changelog: 0.19.0...0.19.1

• Bump MSRV to 1.80
• Refactor MinMax algorithm to also track sort order

Full Changelog: 0.18.0...0.19.0