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README.md

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+---
+license: cc-by-nc-4.0
+task_categories:
+- tabular-classification
+- token-classification
+language:
+- en
+tags:
+- synthetic-data
+- genomics
+- bioinformatics
+- dna
+- sequencing
+size_categories:
+- 100M<n<1B
+---
+
+# FreeSyntheticGenomicReads200M
+
+A free dataset of 200 million fully synthetic short-read DNA sequences, built for developers, researchers, and students who need realistic sequencing-style data at scale — for testing bioinformatics pipelines, sequence-alignment tools, read-processing systems, or teaching computational biology. No real genomes, organisms, or individuals are represented in this data; every sequence is randomly generated.
+
+## Schema
+
+| Column | Type | Description |
+|---|---|---|
+| read_id | string | Unique read identifier |
+| sequence | string | 150 bp read sequence (A/C/G/T) |
+| quality_scores | string | Per-base Phred+33 quality string (150 chars) |
+| chromosome | string | Mapped chromosome (chr1-chr22, chrX, chrY, chrM), or * if unmapped |
+| position | int | 1-based reference position, or 0 if unmapped |
+| strand | string | + or - for mapped reads, * if unmapped |
+| mapping_quality | int | MAPQ score (0-60) |
+| gc_content | float | GC fraction of the read (0-1) |
+| is_mapped | bool | Whether the read is mapped |
+| read_length | int | Read length in bases (150) |
+
+## Format
+
+Single Parquet file, Snappy compression, ~44 GB, 200,000,000 rows.
+
+## Quick Start
+
+Note: this dataset is ~44 GB and 200M rows. Do not load it all at once — stream it in batches or query it with a columnar engine.
+
+**duckdb (recommended)**
+```python
+import duckdb
+duckdb.sql("SELECT * FROM 'genomic_200M.parquet' LIMIT 10").show()
+```
+
+**pyarrow batches**
+```python
+import pyarrow.parquet as pq
+pf = pq.ParquetFile("genomic_200M.parquet")
+for batch in pf.iter_batches(batch_size=100000):
+    ...  # process each batch
+```
+
+**datasets (streaming)**
+```python
+from datasets import load_dataset
+ds = load_dataset("ziadatalabs/FreeSyntheticGenomicReads200M", streaming=True)
+```
+
+## Notes
+
+Sequences are 150 bp random A/C/G/T with per-base Phred+33 quality strings skewed toward high quality, mirroring the shape of real short-read output. Reads are mapped (~94%) across chromosomes weighted by real human chromosome sizes, with mapping quality, position, strand, and GC content populated accordingly; unmapped reads carry the standard * / 0 placeholders. All entirely synthetic — no real biological sequence is represented.
+
+## License & Usage
+
+Released under CC BY-NC 4.0 — personal, research, and educational use permitted, attribution required, no commercial use.
+
+---
+
+Created by Zia Data Labs. Questions or feedback: zia.data.team@protonmail.com