undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

When running: python -m src.flownet2.test --input_a data/samples/0img0.ppm --input_b data/samples/0img1.ppm --out ./

I get:

Traceback (most recent call last):
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/content/flownet2-tf/src/flownet2/test.py", line 4, in <module>
    from .flownet2 import FlowNet2
  File "/content/flownet2-tf/src/flownet2/flownet2.py", line 2, in <module>
    from ..flownet_css.flownet_css import FlowNetCSS
  File "/content/flownet2-tf/src/flownet_css/flownet_css.py", line 2, in <module>
    from ..flownet_cs.flownet_cs import FlowNetCS
  File "/content/flownet2-tf/src/flownet_cs/flownet_cs.py", line 2, in <module>
    from ..flownet_c.flownet_c import FlowNetC
  File "/content/flownet2-tf/src/flownet_c/flownet_c.py", line 3, in <module>
    from ..correlation import correlation
  File "/content/flownet2-tf/src/correlation.py", line 4, in <module>
    tf.resource_loader.get_path_to_datafile("./ops/build/correlation.so"))
  File "/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/load_library.py", line 61, in load_op_library
    lib_handle = py_tf.TF_LoadLibrary(library_filename)
tensorflow.python.framework.errors_impl.NotFoundError: /content/flownet2-tf/src/./ops/build/correlation.so: undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE

I've looked at previous issues and tried all the solutions but I cannot fix this issue. Here is my Makefile:

# Makefile

TF_INC = `python -c "import tensorflow; print(tensorflow.sysconfig.get_include())"`
TF_LIB = `python -c "import tensorflow; print(tensorflow.sysconfig.get_lib())"`
ifndef CUDA_HOME
    CUDA_HOME := /usr/local/cuda
endif

CC        = gcc -O2 -pthread
CXX       = g++
GPUCC     = nvcc  --expt-relaxed-constexpr
CFLAGS    = -std=c++11 -I$(TF_INC) -I"$(CUDA_HOME)/.." -DGOOGLE_CUDA=1 -DNDEBUG
GPUCFLAGS = -c
LFLAGS    = -pthread -shared -fPIC
GPULFLAGS = -x cu -Xcompiler -fPIC
CGPUFLAGS = -L$(CUDA_HOME)/lib -L$(CUDA_HOME)/lib64 -lcudart -L$(TF_LIB) -ltensorflow_framework

OUT_DIR   = src/ops/build
PREPROCESSING_SRC = "src/ops/preprocessing/preprocessing.cc" "src/ops/preprocessing/kernels/flow_augmentation.cc" "src/ops/preprocessing/kernels/augmentation_base.cc" "src/ops/preprocessing/kernels/data_augmentation.cc"
GPU_SRC_DATA_AUG    = src/ops/preprocessing/kernels/data_augmentation.cu.cc
GPU_SRC_FLOW        = src/ops/preprocessing/kernels/flow_augmentation_gpu.cu.cc
GPU_PROD_DATA_AUG   = $(OUT_DIR)/data_augmentation.o
GPU_PROD_FLOW       = $(OUT_DIR)/flow_augmentation_gpu.o
PREPROCESSING_PROD  = $(OUT_DIR)/preprocessing.so

DOWNSAMPLE_SRC = "src/ops/downsample/downsample_kernel.cc" "src/ops/downsample/downsample_op.cc"
GPU_SRC_DOWNSAMPLE  = src/ops/downsample/downsample_kernel_gpu.cu.cc
GPU_PROD_DOWNSAMPLE = $(OUT_DIR)/downsample_kernel_gpu.o
DOWNSAMPLE_PROD     = $(OUT_DIR)/downsample.so

CORRELATION_SRC = "src/ops/correlation/correlation_kernel.cc" "src/ops/correlation/correlation_grad_kernel.cc" "src/ops/correlation/correlation_op.cc"
GPU_SRC_CORRELATION  = src/ops/correlation/correlation_kernel.cu.cc
GPU_SRC_CORRELATION_GRAD  = src/ops/correlation/correlation_grad_kernel.cu.cc
GPU_SRC_PAD = src/ops/correlation/pad.cu.cc
GPU_PROD_CORRELATION = $(OUT_DIR)/correlation_kernel_gpu.o
GPU_PROD_CORRELATION_GRAD = $(OUT_DIR)/correlation_grad_kernel_gpu.o
GPU_PROD_PAD = $(OUT_DIR)/correlation_pad_gpu.o
CORRELATION_PROD    = $(OUT_DIR)/correlation.so

FLOWWARP_SRC = "src/ops/flow_warp/flow_warp_op.cc" "src/ops/flow_warp/flow_warp.cc" "src/ops/flow_warp/flow_warp_grad.cc"
GPU_SRC_FLOWWARP = "src/ops/flow_warp/flow_warp.cu.cc"
GPU_SRC_FLOWWARP_GRAD = "src/ops/flow_warp/flow_warp_grad.cu.cc"
GPU_PROD_FLOWWARP = "$(OUT_DIR)/flow_warp_gpu.o"
GPU_PROD_FLOWWARP_GRAD = "$(OUT_DIR)/flow_warp_grad_gpu.o"
FLOWWARP_PROD = "$(OUT_DIR)/flow_warp.so"

ifeq ($(OS),Windows_NT)
    detected_OS := Windows
else
    detected_OS := $(shell sh -c 'uname -s 2>/dev/null || echo not')
endif
ifeq ($(detected_OS),Darwin)  # Mac OS X
    CGPUFLAGS += -undefined dynamic_lookup
endif
ifeq ($(detected_OS),Linux)
    CFLAGS += -D_MWAITXINTRIN_H_INCLUDED -D_FORCE_INLINES -D__STRICT_ANSI__
endif

all: preprocessing downsample correlation flowwarp

preprocessing:
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_DATA_AUG) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_DATA_AUG)
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_FLOW) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_FLOW)
    $(CXX) -g $(CFLAGS)  $(PREPROCESSING_SRC) $(GPU_PROD_DATA_AUG) $(GPU_PROD_FLOW) $(LFLAGS) $(CGPUFLAGS) -o $(PREPROCESSING_PROD)

downsample:
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_DOWNSAMPLE) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_DOWNSAMPLE)
    $(CXX) -g $(CFLAGS)  $(DOWNSAMPLE_SRC) $(GPU_PROD_DOWNSAMPLE) $(LFLAGS) $(CGPUFLAGS) -o $(DOWNSAMPLE_PROD)

correlation:
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_CORRELATION) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_CORRELATION)
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_CORRELATION_GRAD) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_CORRELATION_GRAD)
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_PAD) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_PAD)
    $(CXX) -g $(CFLAGS)  $(CORRELATION_SRC) $(GPU_PROD_CORRELATION) $(GPU_PROD_CORRELATION_GRAD) $(GPU_PROD_PAD) $(LFLAGS) $(CGPUFLAGS) -o $(CORRELATION_PROD)

flowwarp:
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_FLOWWARP) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_FLOWWARP)
    $(GPUCC) -g $(CFLAGS) $(GPUCFLAGS) $(GPU_SRC_FLOWWARP_GRAD) $(GPULFLAGS) $(GPUDEF) -o $(GPU_PROD_FLOWWARP_GRAD)
    $(CXX) -g $(CFLAGS)  $(FLOWWARP_SRC) $(GPU_PROD_FLOWWARP) $(GPU_PROD_FLOWWARP_GRAD) $(LFLAGS) $(CGPUFLAGS) -o $(FLOWWARP_PROD)

clean:
rm -f $(PREPROCESSING_PROD) $(GPU_PROD_FLOW) $(GPU_PROD_DATA_AUG) $(DOWNSAMPLE_PROD) $(GPU_PROD_DOWNSAMPLE)

I'm running on colab.

Cuda Version: Cuda compilation tools, release 10.0, V10.0.130

TensorFlow Version: 1.13.1

sampepose / flownet2-tf

undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE #87