add figures ch06

Author: leandro

06_summarization.ipynb

@@ -269,6 +269,13 @@
     "### T5"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<img alt=\"T5\" width=\"700\" caption=\"Diagram of T5's text-to-text framework (courtesy of Colin Raffel); besides translation and summarization, the CoLA (linguistic acceptability) and STSB (semantic similarity) tasks are shown\" src=\"images/chapter08_t5.png\" id=\"T5\"/>"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -307,6 +314,13 @@
     "### PEGASUS"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<img alt=\"pegasus\" width=\"700\" caption=\"Diagram of PEGASUS architecture (courtesy of Jingqing Zhang et al.)\" src=\"images/chapter08_pegasus.png\" id=\"pegasus\"/>"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,