replace num_rows with head (#348)

Co-authored-by: Karl Higley <karlb@nvidia.com>
Co-authored-by: rnyak <16246900+rnyak@users.noreply.github.com>

Author: 3 people

examples/Serving-Ranking-Models-With-Merlin-Systems.ipynb

@@ -27,6 +27,7 @@
    ]
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    "id": "f550a0e5",
    "metadata": {},
@@ -70,6 +71,7 @@
    ]
   },
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+   "attachments": {},
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    "id": "1346eec7-48d9-41b3-a3f7-c88230a6f24c",
    "metadata": {},
@@ -90,6 +92,7 @@
    ]
   },
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+   "attachments": {},
    "cell_type": "markdown",
    "id": "222fde5f",
    "metadata": {},
@@ -118,6 +121,7 @@
    ]
   },
   {
+   "attachments": {},
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    "id": "746fba56-36af-44a3-8beb-34ca026648be",
    "metadata": {},
@@ -150,6 +154,7 @@
    ]
   },
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+   "attachments": {},
    "cell_type": "markdown",
    "id": "143795f2",
    "metadata": {},
@@ -160,6 +165,7 @@
    ]
   },
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+   "attachments": {},
    "cell_type": "markdown",
    "id": "bd5b046f",
    "metadata": {},
@@ -210,6 +216,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "53908458",
    "metadata": {
@@ -248,6 +255,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "8b916afa",
    "metadata": {},
@@ -638,6 +646,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "4edcbd33-f845-4921-b295-46ad366da722",
    "metadata": {},
@@ -667,6 +676,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "96aa55fb",
    "metadata": {},
@@ -735,6 +745,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "0b99146c",
    "metadata": {},
@@ -761,6 +772,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "c75e2eb9",
    "metadata": {},
@@ -800,6 +812,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "358bb59b-796a-4e1e-8e02-b7d3b86c27f9",
    "metadata": {},
@@ -845,6 +858,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "dfbc6f01-5ccf-43a2-ae4f-8451a420fc70",
    "metadata": {},
@@ -1032,6 +1046,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "9691d28f-80d8-4520-b6e6-b7e260c50380",
    "metadata": {},
@@ -1061,6 +1076,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "50fb442d-d918-4b1a-a825-dfce4f75bc02",
    "metadata": {},
@@ -1081,6 +1097,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "10c00a98-a30e-45ca-9ab6-667621a20c75",
    "metadata": {},
@@ -1111,6 +1128,7 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "f37053aa-9a01-40ce-ac81-e6edf266f2af",
    "metadata": {},