fix data loader mut_dptr to dptr (#3222)

Co-authored-by: NOuYang Yu <xuanjiuye@gmail.com>

oneflow/customized/kernels/image_preprocess_kernels.cpp

@@ -38,7 +38,7 @@ class ResizeToStaticShapeKernel final : public user_op::OpKernel {
     int64_t record_num = in_blob->shape().At(0);
     CHECK_GT(record_num, 0);
 
-    TensorBuffer* buffers = in_blob->mut_dptr<TensorBuffer>();
+    const TensorBuffer* buffers = in_blob->dptr<TensorBuffer>();
     uint8_t* out_dptr = out_blob->mut_dptr<uint8_t>();
     const ShapeView& out_shape = out_blob->shape();
     CHECK(out_shape.NumAxes() == 4);  // {N, H, W, C}
@@ -52,7 +52,7 @@ class ResizeToStaticShapeKernel final : public user_op::OpKernel {
     int opencv_inter_type = GetOpencvInterp(interp_type);
 
     MultiThreadLoop(record_num, [&](size_t i) {
-      TensorBuffer* buffer = buffers + i;
+      const TensorBuffer* buffer = buffers + i;
       uint8_t* dptr = out_dptr + one_sample_elem_cnt * i;
       const Shape& in_shape = buffer->shape();
       CHECK(in_shape.NumAxes() == 3);  // {H, W, C}
@@ -85,12 +85,12 @@ class ResizeShorterToTensorBufferKernel final : public user_op::OpKernel {
     int64_t record_num = in_blob->shape().At(0);
     CHECK_GT(record_num, 0);
 
-    TensorBuffer* in_buffers = in_blob->mut_dptr<TensorBuffer>();
+    const TensorBuffer* in_buffers = in_blob->dptr<TensorBuffer>();
     TensorBuffer* out_buffers = out_blob->mut_dptr<TensorBuffer>();
     int64_t resize_shorter = ctx->Attr<int64_t>("resize_shorter");
 
     MultiThreadLoop(record_num, [&](size_t i) {
-      TensorBuffer* in_buffer = in_buffers + i;
+      const TensorBuffer* in_buffer = in_buffers + i;
       TensorBuffer* out_buffer = out_buffers + i;
       const Shape& in_shape = in_buffer->shape();
       CHECK_EQ(in_shape.NumAxes(), 3);  // {H, W, C}

oneflow/customized/kernels/ofrecord_decoder_kernels.cpp

@@ -68,7 +68,7 @@ class OFRecordRawDecoderKernel final : public user_op::OpKernel {
     int64_t record_num = in_blob->shape().At(0);
     int64_t sample_elem_cnt = out_blob->shape().Count(1);
     CHECK(record_num > 0);
-    OFRecord* records = in_blob->mut_dptr<OFRecord>();
+    const OFRecord* records = in_blob->dptr<OFRecord>();
     T* out_dptr = out_blob->mut_dptr<T>();
     const std::string& name = ctx->Attr<std::string>("name");
 
@@ -219,7 +219,7 @@ class OFRecordImageDecoderRandomCropKernel final : public user_op::OpKernel {
     CHECK(record_num > 0);
     user_op::Tensor* in_blob = ctx->Tensor4ArgNameAndIndex("in", 0);
     CHECK_EQ(out_blob->shape(), in_blob->shape());
-    OFRecord* records = in_blob->mut_dptr<OFRecord>();
+    const OFRecord* records = in_blob->dptr<OFRecord>();
     TensorBuffer* buffers = out_blob->mut_dptr<TensorBuffer>();
     const std::string& name = ctx->Attr<std::string>("name");
     const std::string& color_space = ctx->Attr<std::string>("color_space");
@@ -252,7 +252,7 @@ class OFRecordImageDecoderKernel final : public user_op::OpKernel {
     CHECK(record_num > 0);
     user_op::Tensor* in_blob = ctx->Tensor4ArgNameAndIndex("in", 0);
     CHECK_EQ(out_blob->shape(), in_blob->shape());
-    OFRecord* records = in_blob->mut_dptr<OFRecord>();
+    const OFRecord* records = in_blob->dptr<OFRecord>();
     TensorBuffer* buffers = out_blob->mut_dptr<TensorBuffer>();
     const std::string& name = ctx->Attr<std::string>("name");
     const std::string& color_space = ctx->Attr<std::string>("color_space");