fix/positive negative pair op (#16895)

* fix infershape in runtime

* fix infershape in runtime
test=develop

* fix infershape in runtime

paddle/fluid/operators/positive_negative_pair_op.cc

@@ -61,23 +61,31 @@ class PositiveNegativePairOp : public framework::OperatorWithKernel {
     auto query_dim = ctx->GetInputDim("QueryID");
     PADDLE_ENFORCE_EQ(score_dim.size(), 2, "Score should be a 2-D tensor.");
     PADDLE_ENFORCE_EQ(label_dim.size(), 2, "Label should be a 2-D tensor.");
-    PADDLE_ENFORCE_EQ(
-        label_dim[0], score_dim[0],
-        "Tensor Score and Label should have the same height (batch size).");
-    PADDLE_ENFORCE_EQ(label_dim[1], 1,
-                      "The width of Label should be 1, i.e. each item should "
-                      "have a scalar label.");
-    PADDLE_ENFORCE(query_dim == label_dim,
-                   "QueryID should have the same shape as Label.");
-    if (ctx->HasInput("Weight")) {
-      PADDLE_ENFORCE(ctx->GetInputDim("Weight") == label_dim,
-                     "Weight should have the same shape as Label.");
+
+    if (ctx->IsRuntime() ||
+        (score_dim[0] > 0 && label_dim[0] > 0 && query_dim[0] > 0)) {
+      PADDLE_ENFORCE_EQ(
+          label_dim[0], score_dim[0],
+          "Tensor Score and Label should have the same height (batch size).");
+
+      PADDLE_ENFORCE_EQ(label_dim[1], 1,
+                        "The width of Label should be 1, i.e. each item should "
+                        "have a scalar label.");
+
+      PADDLE_ENFORCE(query_dim == label_dim,
+                     "QueryID should have the same shape as Label.");
+
+      if (ctx->HasInput("Weight")) {
+        PADDLE_ENFORCE(ctx->GetInputDim("Weight") == label_dim,
+                       "Weight should have the same shape as Label.");
+      }
+
+      int column = ctx->Attrs().Get<int>("column");
+      auto depth = score_dim[1];
+      PADDLE_ENFORCE(column < depth && column >= -depth,
+                     "Attribute column should be in the range of [-%l, %l)",
+                     depth, depth);
     }
-    int column = ctx->Attrs().Get<int>("column");
-    auto depth = score_dim[1];
-    PADDLE_ENFORCE(column < depth && column >= -depth,
-                   "Attribute column should be in the range of [-%l, %l)",
-                   depth, depth);
 
     ctx->SetOutputDim("PositivePair", scalar_dim);
     ctx->SetOutputDim("NegativePair", scalar_dim);