it's a numpy list

app.py

@@ -77,7 +77,7 @@ def prepare_heatmap_data(data):
     heatmap_data = pd.DataFrame(0, index=range(len(data)), columns=id2label.values())
     for idx, item in enumerate(data):
         print(item) # DEBUG
-        for idy, confidence in enumerate(item["emotions"]):
+        for idy, confidence in enumerate(item["emotions"].tolist()): # it's a numpy array...
             emotion = id2label[idy]
             heatmap_data.at[idx, emotion] = confidence
     heatmap_data.index = [item["sentence"] for item in data]