fix batch_axis bugs in ConvFilterGradOp and DecodeOFRecordOp

oneflow/core/operator/conv_filter_grad_op.cpp

@@ -93,7 +93,7 @@ void ConvFilterGradOp::VirtualGenKernelConf(
 Maybe<void> ConvFilterGradOp::InferBatchAxis(
     std::function<OptInt64*(const std::string&)> BatchAxis4BnInOp) const {
   CHECK_OR_RETURN(*BatchAxis4BnInOp("dy") == *BatchAxis4BnInOp("x"));
-  *BatchAxis4BnInOp("filter_diff") = *BatchAxis4BnInOp("x");
+  BatchAxis4BnInOp("filter_diff")->clear_value();
   return Maybe<void>::Ok();
 }
 

oneflow/core/operator/decode_ofrecord_op.cpp

@@ -76,7 +76,10 @@ LogicalBlobId DecodeOFRecordOp::obn2lbi(const std::string& output_bn) const {
 
 Maybe<void> DecodeOFRecordOp::InferBatchAxis(
     std::function<OptInt64*(const std::string&)> BatchAxis4BnInOp) const {
-  if (op_conf().decode_ofrecord_conf().has_in()) { CHECK_OR_RETURN(BatchAxis4BnInOp(SoleIbn())); }
+  if (op_conf().decode_ofrecord_conf().has_in()) {
+      CHECK_OR_RETURN(BatchAxis4BnInOp(SoleIbn())->has_value());
+      CHECK_EQ_OR_RETURN(BatchAxis4BnInOp(SoleIbn())->value(), 0);
+  }
   for (const auto& obn : output_bns()) { BatchAxis4BnInOp(obn)->set_value(0); }
   return Maybe<void>::Ok();
 }