[FrontEnd][PaddlePaddle] fix fill_constant_batch_size_like when attri…

…bute str_value be empty.

This happens when export ppyolo with PaddleDetection release/2.2.

ngraph/frontend/paddlepaddle/src/op/fill_constant_batch_size_like.cpp

@@ -55,25 +55,51 @@ static std::shared_ptr<Node> set_val(int32_t idx, std::shared_ptr<Node> val_node
     return std::make_shared<ngraph::opset6::Concat>(nodes, 0);
 }
 
+// "str_value" type string, default empty. "value" type float, default 0. They are value to be filled.
+// if "str_value" empty, will fill with "value", else fill with "str_value".
+// reference:
+// https://github.com/PaddlePaddle/Paddle/blob/93d862b0adf224a0af547d1442c57fbd6d0e8efc/paddle/fluid/operators/fill_constant_batch_size_like_op.cc#L41
+// https://github.com/PaddlePaddle/Paddle/blob/93d862b0adf224a0af547d1442c57fbd6d0e8efc/paddle/fluid/operators/fill_constant_batch_size_like_op.h#L44
 static Output<Node> get_seed_node(const NodeContext& node) {
     auto dtype = node.get_attribute<element::Type>("dtype");
     Output<Node> val_node;
     auto str_value = node.get_attribute<std::string>("str_value");
-    switch (dtype) {
-    case element::i32:
-        val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stoi(str_value)});
-        break;
-    case element::i64:
-        val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stoll(str_value)});
-        break;
-    case element::f32:
-        val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stof(str_value)});
-        break;
-    case element::f64:
-        val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stod(str_value)});
-        break;
-    default:
-        throw std::runtime_error("fill_constant_batch_size_like: dtype value is invalid");
+
+    if (str_value.empty()) {
+        auto float_value = node.get_attribute<float>("value");
+        switch (dtype) {
+        case element::i32:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {static_cast<int>(float_value)});
+            break;
+        case element::i64:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {static_cast<long long>(float_value)});
+            break;
+        case element::f32:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {float_value});
+            break;
+        case element::f64:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {static_cast<double>(float_value)});
+            break;
+        default:
+            throw std::runtime_error("fill_constant_batch_size_like: dtype value is invalid");
+        }
+    } else {
+        switch (dtype) {
+        case element::i32:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stoi(str_value)});
+            break;
+        case element::i64:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stoll(str_value)});
+            break;
+        case element::f32:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stof(str_value)});
+            break;
+        case element::f64:
+            val_node = ngraph::opset6::Constant::create(dtype, {1}, {std::stod(str_value)});
+            break;
+        default:
+            throw std::runtime_error("fill_constant_batch_size_like: dtype value is invalid");
+        }
     }
 
     return val_node;