diff --git a/README.md b/README.md
index 9d4caa1..2e6111d 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,17 @@ Supported model names:
 - allenai/longformer-base-4096-extra.pos.embd.only
 - allenai/longformer-large-4096-extra.pos.embd.only
 
+***global_attention_mask***: *torch.Tensor*
+
+defaults to None.
+
+
+***pooler_output***: *bool*
+
+The flag controllling whether to return outputs with pooled features, defaults to False.
+The default output is in shape of (num_tokens, dim) for each input text.
+If True, then the output will be a vector in (dim,) for each input text.
+
 <br />
 
 ## Interface
diff --git a/longformer.py b/longformer.py
index f0f420a..4aa96b9 100644
--- a/longformer.py
+++ b/longformer.py
@@ -25,10 +25,21 @@ class Longformer(NNOperator):
     Args:
         model_name (`str`):
             Which model to use for the embeddings.
+        global_attention_mask (`torch.Tensor`):
+            Global attention mask depending on tasks
+        pooler_output (`bool`):
+            Whether to pool features
     """
-    def __init__(self, model_name: str = 'allenai/longformer-base-4096') -> None:
+    def __init__(
+            self,
+            model_name: str = 'allenai/longformer-base-4096',
+            global_attention_mask: torch.Tensor = None,
+            pooler_output: bool = False
+    ):
         super().__init__()
         self.model_name = model_name
+        self.global_attention_mask = global_attention_mask
+        self.pooler_output = pooler_output
         try:
             self.model = LongformerModel.from_pretrained(model_name)
         except Exception as e:
@@ -47,13 +58,22 @@ class Longformer(NNOperator):
             log.error(f'Invalid input for the tokenizer: {self.model_name}')
             raise e
         try:
-            attention_mask = None
-            outs = self.model(input_ids, attention_mask=attention_mask, labels=input_ids, output_hidden_states=True)
+            attention_mask = torch.ones(
+                input_ids.shape, dtype=torch.long, device=input_ids.device
+            )
+            outs = self.model(
+                input_ids,
+                attention_mask=attention_mask,
+                global_attention_mask=self.global_attention_mask
+            )
         except Exception as e:
             log.error(f'Invalid input for the model: {self.model_name}')
             raise e
         try:
-            feature_vector = outs[1].squeeze()
+            if self.pooler_output:
+                feature_vector = outs.pooler_output.squeeze(0)
+            else:
+                feature_vector = outs.last_hidden_state.squeeze(0)
         except Exception as e:
             log.error(f'Fail to extract features by model: {self.model_name}')
             raise e