sparse-CRAM

Compressed Row-Access Matrix file format.

Goal : Simple and Efficient storage of 2d sparse matrices for memory efficient access of rows columns and ranges.

Header Section:
- Describes the overall file metadata.
- Fixed size for simplicity.
Index Section:
- Row Index
  - Maps rows to their corresponding data offsets in the file.
Data Section:
- Row Data
  - Contains the actual sparse matrix data in a compressed Row Format. along with the column number

Description: File identifiers and general fine info
Size: 40 bytes

Field	Type	Size (Bytes)	Description
Magic Number	ASCII	4	File identifier - CRAM
Version	Integer	2	File format version
Rows	Integer	4	Number of rows in the matrix
Columns	Integer	4	Number of columns in the matrix
Non-Zero Count	Integer	8	Total number of non-zero entries
Index Offset	Integer	8	Byte offset to the index section
Data Offset	Integer	8	Byte offset to the data section

Description: Maps Rows to their corresponding data offsets
Size: 16 bytes

Field	Type	Size (Bytes)	Description
Row ID	Integer	4	Row ID
Offset	Integer	8	Byte offset in the data section
Non-Zero Count	Integer	4	Number of non-zero entries

Description: Data elements of the
Size: 8

Field	Type	Size (Bytes)	Description
Column Index	Integer	4	Column index of the value
Value	Float	4	The matrix value

To install the package

pip install sparse-CRAM

Usage:

cram_path = '/path/to/cram_file.cram'
fileparser = CRAM.FileParser(cram_path)
headers = fileparser.parse_headers()

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