add base model usage

pages/model-tree.md

@@ -0,0 +1,40 @@
+---
+title: Model Tree Usage
+---
+
+### Base Model Tag Usage by Week (last 12 weeks)
+
+```sql model_tree_usage
+WITH model_tags AS (
+  SELECT 
+    DATE_TRUNC('week', CAST(createdAt AS TIMESTAMP)) AS week,
+    id,
+    UNNEST(tags) AS tag
+    FROM read_parquet('https://huggingface.co/datasets/cfahlgren1/hub-stats/resolve/refs%2Fconvert%2Fparquet/models/train/0000.parquet?download=true')
+    WHERE CAST(createdAt AS TIMESTAMP) >= DATE_TRUNC('week', CURRENT_DATE) - INTERVAL '12 weeks'
+  ),
+  weekly_counts AS (
+    SELECT 
+      week,
+      COUNT(DISTINCT id) AS total_models,
+      COUNT(DISTINCT CASE WHEN LOWER(tag) LIKE '%base_model:%' THEN id END) AS base_model_count
+    FROM model_tags
+    GROUP BY week
+  )
+  SELECT 
+    week,
+    (base_model_count / total_models) AS percentage_model_with_base_model_tag
+FROM weekly_counts
+ORDER BY week DESC;
+```
+
+
+<BarChart 
+    data={model_tree_usage}
+    x=week
+    y=percentage_model_with_base_model_tag
+    yFmt=pct
+    yTickMarks=true
+    labels=true
+    yMax=1
+/>