Update README.md

README.md

@@ -31,6 +31,22 @@ dataset_info:
   dataset_size: 1948760000
 ---
 
+## Dataset Structure
+
+This dataset contains clean simulated weak lensing maps without noise.
+
+### Data Fields
+
+- **input**: 4D tensor of shape (N, 1, 66, 66) containing weak lensing maps, N=number of examples.
+- **label**: 2D array of shape (N, 2) containing the label for cosmological parameters $\Omega_m$ and $\sigma_8$ for each examples.
+
+### Data Splits
+
+- **train**: 90,000 examples
+- **validation**: 10,000 examples
+- **test**: 10,000 examples
+
+## Usage
 ```
 from datasets import load_dataset
 dataset = load_dataset('BrachioLab/massmaps-cosmogrid-100k')