Issue google#356: Show first and last events instead of only first on…

…es when displaying an EventSet

temporian/implementation/numpy/data/display_utils.py

@@ -77,6 +77,9 @@ def display_html(evset: EventSet) -> str:
         index_data = evset.data[index_key]
         num_timestamps = len(index_data.timestamps)
         max_timestamps = config.display_max_events or num_timestamps
+        #Slices timestamps and features if there are more than 6 events
+        display_timestamps = np.concatenate((index_data.timestamps[:3], index_data.timestamps[-3:])) if num_timestamps > 6 else index_data.timestamps[:num_timestamps]
+        display_features = [np.concatenate((values[:3], values[-3:])) if num_timestamps > 6 else values for values in index_data.features]
 
         # Display index values
         html_index_value = html_div(dom)
@@ -125,10 +128,9 @@ def display_html(evset: EventSet) -> str:
 
         # Rows with events
         for timestamp_idx, timestamp in enumerate(
-            index_data.timestamps[:max_timestamps]
+            display_timestamps
         ):
             row = []
-
             # Timestamp column
             timestamp_repr = (
                 convert_timestamp_to_datetime(timestamp)
@@ -138,23 +140,19 @@ def display_html(evset: EventSet) -> str:
             row.append(f"{timestamp_repr}")
 
             # Feature values
-            for val, feature in zip(
-                index_data.features[:max_features], visible_feats
-            ):
-                row.append(repr_value_html(val[timestamp_idx], feature.dtype))
+            for feature_idx, feature_schema in enumerate(visible_feats):
+                row.append(repr_value_html(display_features[feature_idx][timestamp_idx], feature_schema.dtype))
+
 
             # Add ... column on the right
             if has_hidden_feats:
                 row.append(ELLIPSIS)
-
-            # Create row and add
-            table.appendChild(html_table_row(dom, row))
-
-        # Add ... row at the bottom
-        if num_timestamps > max_timestamps:
-            # Timestamp + features + <... column if was added>
-            row = [ELLIPSIS] * (1 + len(visible_feats) + int(has_hidden_feats))
+
+            # Create ellipse row if more than 6 entries
             table.appendChild(html_table_row(dom, row))
+            if timestamp_idx == 2 and num_timestamps > 6:
+                ellipsis_row = [ELLIPSIS] * (1 + len(visible_feats) + int(has_hidden_feats))
+                table.appendChild(html_table_row(dom, ellipsis_row))
 
         top.appendChild(table)