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.");
+
+    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);
+    }
 
     ctx->SetOutputDim("PositivePair", scalar_dim);
     ctx->SetOutputDim("NegativePair", scalar_dim);