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README.md

@@ -1,104 +1,78 @@
 ---
-dataset_info:
-- config_name: cold_start
-  features:
-  - name: user_id
-    dtype: string
-  - name: parent_asin
-    dtype: string
-  - name: rating
-    dtype: float64
-  - name: timestamp
-    dtype: int64
-  - name: helpful_vote
-    dtype: int64
-  - name: verified_purchase
-    dtype: bool
-  - name: review_title
-    dtype: string
-  - name: review_text
-    dtype: string
-  - name: date
-    dtype: timestamp[ns]
-  splits:
-  - name: train
-    num_bytes: 2299352
-    num_examples: 7753
-  download_size: 1502832
-  dataset_size: 2299352
-- config_name: interactions
-  features:
-  - name: user_id
-    dtype: string
-  - name: parent_asin
-    dtype: string
-  - name: rating
-    dtype: float64
-  - name: timestamp
-    dtype: int64
-  - name: helpful_vote
-    dtype: int64
-  - name: verified_purchase
-    dtype: bool
-  - name: review_title
-    dtype: string
-  - name: review_text
-    dtype: string
-  - name: date
-    dtype: timestamp[ns]
-  splits:
-  - name: train
-    num_bytes: 184914008
-    num_examples: 473647
-  download_size: 105275880
-  dataset_size: 184914008
-- config_name: items
-  features:
-  - name: parent_asin
-    dtype: string
-  - name: title
-    dtype: string
-  - name: description
-    dtype: string
-  - name: features
-    dtype: string
-  - name: main_category
-    dtype: string
-  - name: categories
-    dtype: string
-  - name: store
-    dtype: string
-  - name: price
-    dtype: float64
-  - name: average_rating
-    dtype: float64
-  - name: rating_number
-    dtype: int64
-  - name: image_url
-    dtype: string
-  - name: has_image
-    dtype: bool
-  - name: has_description
-    dtype: bool
-  - name: has_price
-    dtype: bool
-  splits:
-  - name: train
-    num_bytes: 31153350
-    num_examples: 23158
-  download_size: 17103989
-  dataset_size: 31153350
+license: mit
+task_categories:
+  - text-classification
+  - text-retrieval
+language:
+  - en
+tags:
+  - recommendation-system
+  - collaborative-filtering
+  - amazon-reviews
+  - musical-instruments
+size_categories:
+  - 100K<n<1M
 configs:
-- config_name: cold_start
-  data_files:
-  - split: train
-    path: cold_start/train-*
-- config_name: interactions
-  data_files:
-  - split: train
-    path: interactions/train-*
-- config_name: items
-  data_files:
-  - split: train
-    path: items/train-*
+  - config_name: interactions
+    data_files:
+      - split: train
+        path: interactions/train-*
+  - config_name: items
+    data_files:
+      - split: train
+        path: items/train-*
+  - config_name: cold_start
+    data_files:
+      - split: train
+        path: cold_start/train-*
 ---
+
+# Amazon Musical Instruments — 5-Core Sampled Dataset (2018-2023)
+
+Sampled subset of [Amazon Reviews 2023](https://huggingface.co/datasets/McAuley-Lab/Amazon-Reviews-2023) Musical Instruments category, created for a Data Mining course recommendation system project.
+
+## Sampling Strategy
+
+1. **Time filter:** 2014-01-01 to 2023-09-12
+2. **Iterative 5-core filtering:** Both users and items have at least 5 interactions (iteratively until stable)
+3. **Cold-start test set:** 10000 users with 1-2 reviews held out for cold-start evaluation
+4. **Random seed:** 42
+
+## Configs
+
+This dataset has **three configs**. Load each one separately:
+
+```python
+from datasets import load_dataset
+
+interactions = load_dataset("oyku-tugana/amazon-musical-instruments-2014-2023-5core", "interactions", split="train")
+items        = load_dataset("oyku-tugana/amazon-musical-instruments-2014-2023-5core", "items",        split="train")
+cold_start   = load_dataset("oyku-tugana/amazon-musical-instruments-2014-2023-5core", "cold_start",   split="train")
+```
+
+## Statistics
+
+| Field | Value |
+|---|---|
+| Users (main)        | 53,127 |
+| Items (main)        | 23,158 |
+| Interactions (main) | 473,647 |
+| Sparsity            | 0.999615 |
+| Mean rating         | 4.445 |
+| Items w/ image      | 100.0% |
+| Items w/ description| 69.3% |
+| Items w/ price      | 69.2% |
+| Cold-start users    | 6,904 |
+
+## Schema
+
+### interactions / cold_start
+- `user_id`, `parent_asin`, `rating`, `timestamp` (ms), `date`
+- `helpful_vote`, `verified_purchase`
+- `review_title`, `review_text`
+
+### items
+- `parent_asin`, `title`, `description`, `features`
+- `main_category`, `categories`, `store`
+- `price` (nullable), `average_rating`, `rating_number`
+- `image_url` (nullable), `has_image`, `has_description`, `has_price`