Add data schema for the benchmark run in Bigquery.

The current schema contains the entity information about model
and train data metadata, as well as machine config. Future change
will contain benchmark metric.

The json schema can be used to create bigquery table. A sample
table can be found in
https://bigquery.cloud.google.com/table/tf-benchmark-dashboard:test_benchmark.benchmark_run.

official/benchmark/datastore/schema/benchmark_run.json

+[
+  {
+    "description": "The UUID of the run for the benchmark.",
+    "mode": "REQUIRED",
+    "name": "model_id",
+    "type": "STRING"
+  },
+  {
+    "description": "The name of the model, E.g ResNet50, LeNet-5 etc.",
+    "mode": "REQUIRED",
+    "name": "model_name",
+    "type": "STRING"
+  },
+  {
+    "description": "The date when the test of the model is started",
+    "mode": "REQUIRED",
+    "name": "run_date",
+    "type": "DATETIME"
+  },
+  {
+    "description": "The arbitrary attribute of the model.",
+    "fields": [
+      {
+        "description": "The name of the attribute.",
+        "mode": "REQUIRED",
+        "name": "name",
+        "type": "STRING"
+      },
+      {
+        "description": "The value of the attribute.",
+        "mode": "NULLABLE",
+        "name": "value",
+        "type": "STRING"
+      }
+    ],
+    "mode": "REPEATED",
+    "name": "attribute",
+    "type": "RECORD"
+  },
+  {
+    "description": "The list of hyper parameter of the model.",
+    "fields": [
+      {
+        "description": "The name of the hyper parameter.",
+        "mode": "REQUIRED",
+        "name": "name",
+        "type": "STRING"
+      },
+      {
+        "description": "The string value of the hyper parameter.",
+        "mode": "NULLABLE",
+        "name": "string_value",
+        "type": "STRING"
+      },
+      {
+        "description": "The bool value of the hyper parameter.",
+        "mode": "NULLABLE",
+        "name": "bool_value",
+        "type": "STRING"
+      },
+      {
+        "description": "The int/long value of the hyper parameter.",
+        "mode": "NULLABLE",
+        "name": "long_value",
+        "type": "INTEGER"
+      },
+      {
+        "description": "The double/float value of hyper parameter.",
+        "mode": "NULLABLE",
+        "name": "float_value",
+        "type": "FLOAT"
+      }
+    ],
+    "mode": "REPEATED",
+    "name": "hyper_parameter",
+    "type": "RECORD"
+  },
+  {
+    "description": "The dataset that run with the benchmark.",
+    "mode": "NULLABLE",
+    "name": "dataset",
+    "type": "RECORD",
+    "fields": [
+      {
+        "description": "The name of the dataset that the model is trained/validated with. E.g ImageNet, mnist.",
+        "mode": "REQUIRED",
+        "name": "name",
+        "type": "STRING"
+      },
+      {
+        "description": "The arbitrary attribute of the dataset.",
+        "fields": [
+          {
+            "description": "The name of the attribute.",
+            "mode": "REQUIRED",
+            "name": "name",
+            "type": "STRING"
+          },
+          {
+            "description": "The value of the attribute.",
+            "mode": "NULLABLE",
+            "name": "value",
+            "type": "STRING"
+          }
+        ],
+        "mode": "REPEATED",
+        "name": "attribute",
+        "type": "RECORD"
+      }
+    ]
+  },
+  {
+    "description": "The machine configuration of the benchmark run.",
+    "mode": "NULLABLE",
+    "name": "machine_config",
+    "type": "RECORD",
+    "fields": [
+      {
+        "description": "The platform information of the benchmark run.",
+        "mode": "NULLABLE",
+        "name": "platform_info",
+        "type": "RECORD",
+        "fields": [
+          {
+            "description": "Eg: 64bit.",
+            "mode": "NULLABLE",
+            "name": "bits",
+            "type": "STRING"
+          },
+          {
+            "description": "Eg: ELF.",
+            "mode": "NULLABLE",
+            "name": "linkage",
+            "type": "STRING"
+          },
+          {
+            "description": "Eg: i386.",
+            "mode": "NULLABLE",
+            "name": "machine",
+            "type": "STRING"
+          },
+          {
+            "description": "Eg: 3.13.0-76-generic.",
+            "mode": "NULLABLE",
+            "name": "release",
+            "type": "STRING"
+          },
+          {
+            "description": "Eg: Linux.",
+            "mode": "NULLABLE",
+            "name": "system",
+            "type": "STRING"
+          },
+          {
+            "description": "Eg: #120-Ubuntu SMP Mon Jan 18 15:59:10 UTC 2016.",
+            "mode": "NULLABLE",
+            "name": "version",
+            "type": "STRING"
+          }
+        ]
+      },
+      {
+        "description": "The CPU information of the benchmark run.",
+        "mode": "NULLABLE",
+        "name": "cpu_info",
+        "type": "RECORD",
+        "fields": [
+          {
+            "mode": "NULLABLE",
+            "name": "num_cores",
+            "type": "INTEGER"
+          },
+          {
+            "mode": "NULLABLE",
+            "name": "num_cores_allowed",
+            "type": "INTEGER"
+          },
+          {
+            "description" : "How fast are those CPUs.",
+            "mode": "NULLABLE",
+            "name": "mhz_per_cpu",
+            "type": "FLOAT"
+          },
+          {
+            "description" : "Additional CPU info, Eg: Intel Ivybridge with HyperThreading (24 cores).",
+            "mode": "NULLABLE",
+            "name": "cpu_info",
+            "type": "STRING"
+          },
+          {
+            "description" : "What kind of cpu scaling is enabled on the host. Eg performance, ondemand, conservative, mixed.",
+            "mode": "NULLABLE",
+            "name": "cpu_governor",
+            "type": "STRING"
+          },
+          {
+            "description": "Cache size of the CPUs.",
+            "mode": "NULLABLE",
+            "name": "cache_size",
+            "type": "RECORD",
+            "fields": [
+              {
+                "mode": "NULLABLE",
+                "name": "level",
+                "type": "STRING"
+              },
+              {
+                "mode": "NULLABLE",
+                "name": "size",
+                "type": "INTEGER"
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "mode": "NULLABLE",
+        "name": "gpu_info",
+        "type": "RECORD",
+        "fields": [
+          {
+            "mode": "NULLABLE",
+            "name": "count",
+            "type": "INTEGER"
+          },
+          {
+            "mode": "NULLABLE",
+            "name": "model",
+            "type": "STRING"
+          }
+        ]
+      },
+      {
+        "mode": "NULLABLE",
+        "name": "memory_total",
+        "type": "INTEGER"
+      },
+      {
+        "mode": "NULLABLE",
+        "name": "memory_available",
+        "type": "STRING"
+      }
+    ]
+  }
+]