Clarify math for memory usage

app.py

@@ -254,6 +254,9 @@ def get_mteb_data(tasks=["Clustering"], langs=[], datasets=[], fillna=True, add_
                         MODEL_INFOS[model.modelId]["dim_seq_size"] = list(get_dim_seq_size(model))
                 except:
                     name_without_org = model.modelId.split("/")[-1]
+                    # EXTERNAL_MODEL_TO_SIZE[name_without_org] refers to millions of parameters, so for memory usage
+                    # we multiply by 1e6 to get just the number of parameters, then by 4 to get the number of bytes
+                    # given fp32 precision (4 bytes per float), then divide by 1024**3 to get the number of GB
                     MODEL_INFOS[model.modelId]["dim_seq_size"] = (
                         EXTERNAL_MODEL_TO_DIM.get(name_without_org, ""),
                         EXTERNAL_MODEL_TO_SEQLEN.get(name_without_org, ""),