Update README.md

README.md

@@ -159,8 +159,62 @@ Data provided within this repository can be straightforwardly loaded via the *da
 from datasets import load_dataset
 dataset = load_dataset("MLNTeam-Unical/NFT-70M_transactions")
 
+
+```
+if you want to .... 
+```
+from datasets import load_dataset
+import numpy as np
+
+
+transactions_dataset=load_dataset("MLNTeam-Unical/NFT-70M_transactions")
+
+image_dataset=load_dataset("MLNTeam-Unical/NFT-70M_image")
+
+text_dataset=load_dataset("MLNTeam-Unical/NFT-70M_text")
+
+
+################################################################################
+#compute a mapping from image_id to the row_index within the image dataset
+image_id2row_index={int(id):k for k,id in enumerate(image_dataset["train"]["id"])}
+#compute a mapping from text_id to row_index within the text dataset
+text_id2row_index={int(id):k for k,id in enumerate(text_dataset["train"]["id"])}
+
+
+def get_image_embedding(image_id,image_id2row_index,image_dataset):
+  #if the mapping contains the image, the embedding is present
+  idx_emb=image_id2row_index.get(int(image_id),None)
+  
+  if idx_emb:
+    #if the embedding is present it is returned
+    return np.array(image_dataset["train"].select([idx_emb])["emb"][0])
+  else:
+    #otherwise None is returned 
+    return None
+  
+def get_text_embedding(text_id,text_id2row_index,text_dataset):
+  #if the mapping contains the image, the embedding is present
+  idx_emb=text_id2row_index.get(int(text_id),None)
+  if idx_emb:
+    #if the embedding is present it is returned
+    return np.array(text_dataset["train"].select([idx_emb])["emb"][0])
+  else:
+    #otherwise None is returned 
+    return None
+#### USAGE EXAMPLE  #########
+
+transaction_id=120
+
+id_image=transactions_dataset["train"].select([transaction_id])["collection_image"][0]
+
+image_embedding=get_image_embedding(id_image,image_id2row_index,image_dataset)
+
+id_text=transactions_dataset["train"].select([transaction_id])["collection_description"][0]
+
+text_embedding=get_text_embedding(id_text,text_id2row_index,text_dataset)
 ```
 
+
 ## Ethical use of data and informed consent
 This data repository is made available for research and informational purposes only.