Update README.md

README.md

@@ -144,6 +144,17 @@ data.
 
 ## Data Structure
 
+### genome_map/
+
+This is a parquet dataset which is partitioned by Series and Accession
+
+| Field      | Description                                                    |
+|------------|----------------------------------------------------------------|
+| `seqnames` | Chromosome or sequence name (e.g., chrI, chrII, etc.)          |
+| `start`    | Start position of the genomic interval (1-based coordinates)   |
+| `end`      | End position of the genomic interval (1-based coordinates)     |
+| `pileup`   | Number of reads or signal intensity at this genomic position   |
+
 ### [GSE178430](https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE179430) Metadata
 
 | Field                        | Description                                                                    |
@@ -179,4 +190,46 @@ data.
 | `instrument_model`    | Model of sequencing instrument used for data generation                        |
 
 
+## Usage
+
+The entire repository is large. It may be preferrable to only retrieve specific files or partitions. You can
+use the metadata files to choose which files to pull.
+
+```python
+from huggingface_hub import snapshot_download
+import duckdb
+import os
+
+# Download only the partitioned dataset directory
+repo_path = snapshot_download(
+    repo_id="BrentLab/barkai_compendium",
+    repo_type="dataset",
+    allow_patterns="_metadata.parquet"
+)
+
+dataset_path = os.path.join(repo_path, "GSE178430_metadata.parquet")
+con = duckdb.connect()
+meta_res = conn.execute("SELECT * FROM read_parquet(?) LIMIT 10", [dataset_path]).df()
+
+print(meta_res)
+```
+
+We might choose to take a look at the file with accession `GSM5417602`
+
+```python
+# Download only the partitioned dataset directory
+repo_path = snapshot_download(
+    repo_id="BrentLab/barkai_compendium",
+    repo_type="dataset",
+    allow_patterns="genome_map/series=GSE179430/accession=GSM5417602/*parquet"  # Only the parquet data
+)
+
+# The rest works the same
+dataset_path = os.path.join(repo_path, "genome_map")
+result = conn.execute("SELECT * FROM read_parquet(?) LIMIT 10", 
+                     [f"{dataset_path}/**/*.parquet"]).df()
+
+print(result)
+```
+
 **Dataset Author and Contact**: Chase Mateusiak [@cmatKhan](https://github.com/cmatkhan/)