1 files changed, 27 insertions, 0 deletions
diff --git a/nerv/nn/layer_dag.lua b/nerv/nn/layer_dag.lua
index e9d4d86..25297c2 100644
--- a/nerv/nn/layer_dag.lua
+++ b/nerv/nn/layer_dag.lua
@@ -254,3 +254,30 @@ function DAGLayer:get_params()
     end
     return nerv.ParamRepo.merge(param_repos)
 end
+
+DAGLayer.PORT_TYPES = {
+    INPUT = {},
+    OUTPUT = {},
+    ERR_INPUT = {},
+    ERR_OUTPUT = {}
+}
+
+function DAGLayer:get_intermediate(id, port_type)
+    if id == "<input>" or id == "<output>" then
+        nerv.error("an actual real layer id is expected")
+    end
+    local layer = layers[id]
+    if layer == nil then
+        nerv.error("layer id %s not found", id)
+    end
+    if port_type == DAGLayer.PORT_TYPES.INPUT then
+        return layer.inputs
+    elseif port_type == DAGLayer.PORT_TYPES.OUTPUT then
+        return layer.outputs
+    elseif port_type == DAGLayer.PORT_TYPES.ERR_INPUT then
+        return layer.err_inputs
+    elseif port_type == DAGLayer.PORT_TYPES.ERR_OUTPUT then
+        return layer.err_outputs
+    end
+    nerv.error("unrecognized port type")
+end