Crate vortex_alp

This crate contains an implementation of the floating point compression algorithm from the paper “ALP: Adaptive Lossless floating-Point Compression” by Afroozeh et al.

The compressor has two variants, classic ALP which is well-suited for data that does not use the full precision, and “real doubles”, values that do.

Classic ALP will return small integers, and it is meant to be cascaded with other integer compression techniques such as bit-packing and frame-of-reference encoding. Combined this allows for significant compression on the order of what you can get for integer values.

ALP-RD is generally terminal, and in the ideal case it can represent an f64 is just 49 bits, though generally it is closer to 54 bits per value or ~12.5% compression.

Macros

• match_each_alp_float_ptype

Structs

• ALPArray
• ALPEncoding
  The array encoding
• ALPMetadata
• ALPRDArray
• ALPRDEncoding
  The array encoding
• ALPRDMetadata
• Exponents
• RDEncoder
  Encoder for ALP-RD (“real doubles”) values.

Traits

• ALPFloat
• ALPRDFloat
  Main trait for ALP-RD encodable floating point numbers.

Functions

• alp_encode
• alp_encode_components
• alp_rd_decode
  Decode a vector of ALP-RD encoded values back into their original floating point format.
• decompress