diff --git a/backend/src/impl/db_utils/system_db_utils.py b/backend/src/impl/db_utils/system_db_utils.py
index 56acd7c5..e5cd67ef 100644
--- a/backend/src/impl/db_utils/system_db_utils.py
+++ b/backend/src/impl/db_utils/system_db_utils.py
@@ -229,7 +229,7 @@ def process():
             }
 
             return processor.get_overall_statistics(
-                metadata=processor_metadata, sys_output=system_output_data
+                metadata=processor_metadata, sys_output=system_output_data.samples
             )
 
         try:
@@ -240,10 +240,6 @@ def process():
                 for metric_stat in overall_statistics.metric_stats
             ]
 
-            # TODO(chihhao) needs proper serializiation & deserializiation in SDK
-            overall_statistics.sys_info.tokenizer = (
-                overall_statistics.sys_info.tokenizer.json_repr()
-            )
             # TODO avoid None as nullable seems undeclarable for array and object
             # in openapi.yaml
             if overall_statistics.sys_info.results.calibration is None:
@@ -271,7 +267,7 @@ def db_operations(session: ClientSession) -> str:
                 )
                 DBUtils.drop(output_collection)
                 DBUtils.insert_many(
-                    output_collection, list(system_output_data), False, session
+                    output_collection, list(system_output_data.samples), False, session
                 )
                 return system_db_id
 
diff --git a/backend/src/impl/default_controllers_impl.py b/backend/src/impl/default_controllers_impl.py
index 6a0f5901..34584eb7 100644
--- a/backend/src/impl/default_controllers_impl.py
+++ b/backend/src/impl/default_controllers_impl.py
@@ -17,7 +17,6 @@
 from explainaboard.loaders.loader_registry import get_supported_file_types_for_loader
 from explainaboard.metric import MetricStats
 from explainaboard.processors.processor_registry import get_metric_list_for_processor
-from explainaboard.utils import tokenizer as exb_tokenzier
 from explainaboard_web.impl.auth import get_user
 from explainaboard_web.impl.db_utils.dataset_db_utils import DatasetDBUtils
 from explainaboard_web.impl.db_utils.system_db_utils import SystemDBUtils
@@ -272,10 +271,6 @@ def systems_analyses_post(body: SystemsAnalysesBody):
         ]
 
         system_output_info.metric_configs = metric_configs
-        cls_name = system_output_info.tokenizer.pop("cls_name")
-        system_output_info.tokenizer = getattr(exb_tokenzier, cls_name)(
-            **system_output_info.tokenizer
-        )
 
         processor = get_processor(TaskType(system_output_info.task_name))
         metric_stats = [MetricStats(stat) for stat in system.metric_stats]
diff --git a/backend/templates/requirements.mustache b/backend/templates/requirements.mustache
index ce0be5dc..ed064355 100644
--- a/backend/templates/requirements.mustache
+++ b/backend/templates/requirements.mustache
@@ -7,7 +7,7 @@ Flask-PyMongo
 swagger-ui-bundle >= 0.0.9
 python-dotenv
 pyjwt[crypto] == 2.3.0
-explainaboard == 0.8.15
+explainaboard == 0.9.1
 en_core_web_sm@https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.2.0/en_core_web_sm-3.2.0-py3-none-any.whl
 pre-commit
 marisa_trie
diff --git a/frontend/src/components/SystemSubmitDrawer/index.tsx b/frontend/src/components/SystemSubmitDrawer/index.tsx
index 7118a5f8..ab88e68a 100644
--- a/frontend/src/components/SystemSubmitDrawer/index.tsx
+++ b/frontend/src/components/SystemSubmitDrawer/index.tsx
@@ -100,7 +100,8 @@ export function SystemSubmitDrawer(props: Props) {
     task,
     dataset,
     metric_names,
-    language,
+    source_language,
+    target_language,
     sys_out_file,
     custom_dataset_file,
     code,
@@ -120,7 +121,8 @@ export function SystemSubmitDrawer(props: Props) {
             model_name: name,
             paper_info: {},
             task: task,
-            language,
+            source_language,
+            target_language,
             code,
             is_private,
           },
@@ -143,7 +145,8 @@ export function SystemSubmitDrawer(props: Props) {
             model_name: name,
             paper_info: {},
             task: task,
-            language,
+            source_language,
+            target_language,
             code,
             is_private,
           },
@@ -163,7 +166,8 @@ export function SystemSubmitDrawer(props: Props) {
         "sys_out_file",
         "custom_dataset_file",
         "metric_names",
-        "language",
+        "source_language",
+        "target_language",
         "code",
       ]);
     } catch (e) {
@@ -361,14 +365,22 @@ export function SystemSubmitDrawer(props: Props) {
           </Form.Item>
 
           <Form.Item
-            name="language"
-            label="Language"
+            name="source_language"
+            label="Input Language"
             initialValue="en"
             rules={[{ required: true }]}
           >
             <Select options={[{ value: "en" }]} />
           </Form.Item>
-          <Form.Item name="code" label="Source code link">
+          <Form.Item
+            name="target_language"
+            label="Output Language"
+            initialValue="en"
+            rules={[{ required: true }]}
+          >
+            <Select options={[{ value: "en" }]} />
+          </Form.Item>
+          <Form.Item name="code" label="Source Code Link">
             <Input type="url" />
           </Form.Item>
         </Form>
@@ -385,7 +397,8 @@ interface FormData {
   custom_dataset_file: DataFileValue;
 
   metric_names: string[];
-  language: string;
+  source_language: string;
+  target_language: string;
   code: string;
   is_private: boolean;
 }
diff --git a/frontend/src/components/SystemsTable/SystemTableContent.tsx b/frontend/src/components/SystemsTable/SystemTableContent.tsx
index 185a53bc..d031c7eb 100644
--- a/frontend/src/components/SystemsTable/SystemTableContent.tsx
+++ b/frontend/src/components/SystemsTable/SystemTableContent.tsx
@@ -121,18 +121,28 @@ export function SystemTableContent({
         ),
     },
     {
-      dataIndex: ["system_info", "language"],
+      dataIndex: ["system_info", "split"],
       width: 110,
-      title: "Dataset split",
+      title: "Dataset Split",
       fixed: "left",
       align: "center",
       render: (_, record) => record.system_info.dataset_split || "unspecified",
     },
     {
-      dataIndex: ["system_info", "language"],
+      dataIndex: ["system_info", "source_language"],
       width: 100,
-      title: "Language",
+      title: "Input Lang",
       align: "center",
+      render: (_, record) =>
+        record.system_info.source_language || "unspecified",
+    },
+    {
+      dataIndex: ["system_info", "target_language"],
+      width: 100,
+      title: "Output Lang",
+      align: "center",
+      render: (_, record) =>
+        record.system_info.target_language || "unspecified",
     },
     ...metricColumns,
     {
diff --git a/openapi/openapi.yaml b/openapi/openapi.yaml
index faabc253..a9098534 100644
--- a/openapi/openapi.yaml
+++ b/openapi/openapi.yaml
@@ -468,7 +468,10 @@ components:
         dataset_split:
           type: string
           nullable: true
-        language:
+        source_language:
+          type: string
+          example: en
+        target_language:
           type: string
           example: en
         reload_stat:
@@ -487,14 +490,23 @@ components:
             properties:
               name:
                 type: string
-              language:
+              source_language:
+                type: string
+                nullable: True
+              target_language:
                 type: string
                 nullable: True
               cls_name:
                 type: string
             additionalProperties: true
             required: [name, cls_name]
-        tokenizer:
+        source_tokenizer:
+          type: object
+          properties:
+            cls_name:
+              type: string
+              example: "SingleSpaceTokenizer"
+        target_tokenizer:
           type: object
           properties:
             cls_name:
@@ -523,11 +535,13 @@ components:
         [
           task_name,
           model_name,
-          language,
+          source_language,
+          target_language,
           reload_stat,
           is_print_case,
           conf_value,
-          tokenizer,
+          source_tokenizer,
+          target_tokenizer,
           features,
           results,
           metric_configs,
@@ -658,7 +672,10 @@ components:
           items:
             type: string
           example: [Accuracy]
-        language:
+        source_language:
+          type: string
+          example: en
+        target_language:
           type: string
           example: en
         code: