fix api check

python/paddle/fluid/layers/nn.py

@@ -33,10 +33,12 @@ from .. import core
 __all__ = [
     'fc',
     'embedding',
+    'dynamic_lstm',
     'dynamic_lstmp',
     'dynamic_gru',
     'gru_unit',
     'linear_chain_crf',
+    'crf_decoding',
     'cos_sim',
     'cross_entropy',
     'square_error_cost',
@@ -95,6 +97,7 @@ __all__ = [
     'pad',
     'pad_constant_like',
     'label_smooth',
+    'roi_pool',
     'roi_align',
     'dice_loss',
     'image_resize',