Error when training model Faster-RCNN: NotImplementedError: Cannot convert a symbolic Tensor (cond_2/strided_slice:0) to a numpy array - faster-rcnn

Question

I am trying out a Faster-RCNN tutorial on colab:
https://colab.research.google.com/drive/1U3fkRu6-hwjk7wWIpg-iylL2u5T9t7rr#scrollTo=uQCnYPVDrsgx
But in the training part, I have received this error
The code is:
!python3 /content/models/research/object_detection/model_main.py
--pipeline_config_path={pipeline_fname}
--model_dir={model_dir}
--alsologtostderr
--num_train_steps={num_steps}
--num_eval_steps={num_eval_steps}
The output:
Using TensorFlow backend.
Cause: module 'gast' has no attribute 'Index'
Traceback (most recent call last):
File "/content/models/research/object_detection/model_main.py", line 109, in
tf.app.run()
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/platform/app.py", line 40, in run
_run(main=main, argv=argv, flags_parser=_parse_flags_tolerate_undef)
File "/usr/local/lib/python3.7/dist-packages/absl/app.py", line 312, in run
_run_main(main, args)
File "/usr/local/lib/python3.7/dist-packages/absl/app.py", line 258, in _run_main
sys.exit(main(argv))
File "/content/models/research/object_detection/model_main.py", line 105, in main
tf_estimator.train_and_evaluate(estimator, train_spec, eval_specs[0])
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/training.py", line 473, in train_and_evaluate
return executor.run()
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/training.py", line 613, in run
return self.run_local()
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/training.py", line 714, in run_local
saving_listeners=saving_listeners)
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/estimator.py", line 370, in train
loss = self._train_model(input_fn, hooks, saving_listeners)
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/estimator.py", line 1161, in _train_model
return self._train_model_default(input_fn, hooks, saving_listeners)
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/estimator.py", line 1188, in _train_model_default
input_fn, ModeKeys.TRAIN))
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/estimator.py", line 1025, in _get_features_and_labels_from_input_fn
self._call_input_fn(input_fn, mode))
File "/tensorflow-1.15.2/python3.7/tensorflow_estimator/python/estimator/estimator.py", line 1116, in _call_input_fn
return input_fn(**kwargs)
File "/content/models/research/object_detection/inputs.py", line 765, in _train_input_fn
params=params)
File "/content/models/research/object_detection/inputs.py", line 908, in train_input
reduce_to_frame_fn=reduce_to_frame_fn)
File "/content/models/research/object_detection/builders/dataset_builder.py", line 252, in build
input_reader_config)
File "/content/models/research/object_detection/builders/dataset_builder.py", line 237, in dataset_map_fn
fn_to_map, num_parallel_calls=num_parallel_calls)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/util/deprecation.py", line 324, in new_func
return func(*args, **kwargs)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/data/ops/dataset_ops.py", line 1950, in map_with_legacy_function
use_legacy_function=True))
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/data/ops/dataset_ops.py", line 3472, in init
use_legacy_function=use_legacy_function)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/data/ops/dataset_ops.py", line 2689, in init
self._function.add_to_graph(ops.get_default_graph())
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/framework/function.py", line 545, in add_to_graph
self._create_definition_if_needed()
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/framework/function.py", line 377, in _create_definition_if_needed
self._create_definition_if_needed_impl()
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/framework/function.py", line 408, in _create_definition_if_needed_impl
capture_resource_var_by_value=self._capture_resource_var_by_value)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/framework/function.py", line 944, in func_graph_from_py_func
outputs = func(*func_graph.inputs)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/data/ops/dataset_ops.py", line 2681, in wrapper_fn
ret = _wrapper_helper(*args)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/data/ops/dataset_ops.py", line 2652, in _wrapper_helper
ret = autograph.tf_convert(func, ag_ctx)(*nested_args)
File "/tensorflow-1.15.2/python3.7/tensorflow_core/python/autograph/impl/api.py", line 237, in wrapper
raise e.ag_error_metadata.to_exception(e)
NotImplementedError: in converted code:
/content/models/research/object_detection/data_decoders/tf_example_decoder.py:580 decode
default_groundtruth_weights)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/util/deprecation.py:507 new_func
return func(*args, **kwargs)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/ops/control_flow_ops.py:1235 cond
orig_res_f, res_f = context_f.BuildCondBranch(false_fn)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/ops/control_flow_ops.py:1061 BuildCondBranch
original_result = fn()
/content/models/research/object_detection/data_decoders/tf_example_decoder.py:573 default_groundtruth_weights
dtype=tf.float32)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/ops/array_ops.py:2560 ones
output = _constant_if_small(one, shape, dtype, name)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/ops/array_ops.py:2295 _constant_if_small
if np.prod(shape) < 1000:
<array_function internals>:6 prod
/usr/local/lib/python3.7/dist-packages/numpy/core/fromnumeric.py:3052 prod
keepdims=keepdims, initial=initial, where=where)
/usr/local/lib/python3.7/dist-packages/numpy/core/fromnumeric.py:86 _wrapreduction
return ufunc.reduce(obj, axis, dtype, out, **passkwargs)
/tensorflow-1.15.2/python3.7/tensorflow_core/python/framework/ops.py:736 array
" array.".format(self.name))
NotImplementedError: Cannot convert a symbolic Tensor (cond_2/strided_slice:0) to a numpy array.
I have tried
pip install numpy==1.19.5
But it does not work and received another error
Traceback (most recent call last):
File "/content/models/research/object_detection/model_main.py", line 26, in
from object_detection import model_lib
File "/content/models/research/object_detection/model_lib.py", line 30, in
from object_detection import eval_util
File "/content/models/research/object_detection/eval_util.py", line 35, in
from object_detection.metrics import coco_evaluation
File "/content/models/research/object_detection/metrics/coco_evaluation.py", line 25, in
from object_detection.metrics import coco_tools
File "/content/models/research/object_detection/metrics/coco_tools.py", line 51, in
from pycocotools import coco
File "/usr/local/lib/python3.7/dist-packages/pycocotools/coco.py", line 52, in
from . import mask as maskUtils
File "/usr/local/lib/python3.7/dist-packages/pycocotools/mask.py", line 3, in
import pycocotools._mask as _mask
File "pycocotools/_mask.pyx", line 1, in init pycocotools._mask
ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject