Flat File Parsing And Loading

flat-file-parsing-and-loading

Summary

Parse and load structure-organism pair data from published LOTUS flat files into memory, extracting documented 2D/3D structure identifiers, organism associations, and reference metadata for subsequent binning and validation. This is a foundational data ingestion step that establishes the integrity of source records before downstream analysis.

When to use

When you have published LOTUS flat files (TSV or compressed TSV.GZ) containing structure-organism pairs and need to enumerate unique structures, group by organism prevalence, or validate record counts against gold-standard benchmarks. Apply this skill as the first step in any replication or extension of LOTUS-based analyses.

When NOT to use

• Data is already loaded in memory or in a relational database; use direct schema queries instead.
• Input is a proprietary binary format (HDF5, Parquet) without documented LOTUS correspondence; confirm file origin first.
• Organism counts or structure identifiers have already been binned; this skill is redundant if the source file has been preprocessed.

Inputs

• LOTUS published flat file (TSV or TSV.GZ format)
• structure-organism pair records with columns: structure ID, organism taxon, reference metadata

Outputs

• in-memory table (R data.frame, Python DataFrame) with all structure-organism pairs
• load summary report documenting row count, column schema, and validation status

How to apply

Load the published LOTUS flat file(s) using language-native table parsers (R data.table, Python pandas) that preserve column names and data types. Retain all columns for structure identifiers (2D/3D), organism references, and source citations. Parse compressed formats (TSV.GZ) directly without manual decompression. Validate that the total number of rows matches the documented reference counts (e.g., 588694 | 484174 for 3D|2D unique referenced structure-organism pairs); if discrepancies appear, flag them for investigation before proceeding to grouping or binning operations. Document the exact file path, load timestamp, and row/column schema in a summary report.

Related tools

• R (data.table, base read.csv) (parse and load TSV/TSV.GZ files into R data.frame or data.table for fast row enumeration and schema validation) — https://github.com/lotusnprod/lotus-processor
• Python 3 (pandas.read_csv, gzip) (parse TSV/TSV.GZ files into pandas DataFrame; handle decompression and column type inference) — https://github.com/lotusnprod/lotus-processor
• Make (orchestrate flat-file loading as a reproducible workflow step within the LOTUS processor pipeline) — https://github.com/lotusnprod/lotus-processor

Examples

library(data.table); lotus_2d <- fread('LOTUS_2D_structure_organism_pairs.tsv.gz'); cat(nrow(lotus_2d), 'rows loaded; expected 484174 for 2D pairs')

Evaluation signals

• Row count of loaded table matches published gold-standard counts (588694 for 3D pairs, 484174 for 2D pairs, or subset thereof).
• All expected columns are present (structure identifier, organism, reference); no silent data loss or truncation.
• No parsing errors or warnings; compression handling (GZ) succeeds without manual decompression.
• Summary report documents load timestamp, file path, row/column dimensions, and any missing or malformed records.
• Unique structure and organism counts can be verified post-load (e.g., 231330 | 153956 curated structures for 3D|2D; 42166 unique organisms).

Limitations

• LOTUS flat files are snapshots; if the underlying database is updated, files must be re-downloaded from Zenodo to reflect current data.
• TSV format is line-delimited text; very large files (>10 GB) may require streaming or chunked reading to fit in memory.
• No built-in integrity checks for malformed organism names or duplicate structure–organism pairs within the file; downstream cleaning steps are required.
• Organism or structure identifiers may contain special characters or encodings; ensure appropriate locale/encoding settings (UTF-8) during parsing.

Evidence

• [methods] Load the LOTUS 2D structure-organism pairs table from the published flat file.: "Load the LOTUS 2D structure-organism pairs table from the published flat file."
• [methods] 588694 | 484174 (3D|2D) unique referenced structure-organism pairs: "588694 | 484174 (3D|2D) unique referenced structure-organism pairs"
• [readme] The data used to support the findings of this study have been deposited on Zenodo [https://zenodo.org/communities/the-lotus-initiative]. A snapshot of the repository at the time of publication is also available under the same link.: "data used to support the findings of this study have been deposited on Zenodo [https://zenodo.org/communities/the-lotus-initiative]"
• [intro] LOTUS is a comprehensive collection of documented structure-organism pairs designed to enable computational understanding of organisms and their chemistry.: "LOTUS is a comprehensive collection of documented structure-organism pairs designed to enable computational understanding"
• [methods] 231330 | 153956 (3D|2D) unique curated structures; 42166 unique organisms; originating from 31 initial open databases: "231330 | 153956 (3D|2D) unique curated structures; 42166 unique organisms"