AttributeError: module 'tensorflow' has no attribute 'contrib'. tried other forums already

Question

import os
from object_detection.utils import label_map_util
from object_detection.utils import visualization_utils as viz_utils
from object_detection.builders import model_builder

    AttributeError                            Traceback (most recent call last)
    Cell In[16], line 4
          2 from object_detection.utils import label_map_util
          3 from object_detection.utils import visualization_utils as viz_utils
    ----> 4 from object_detection.builders import model_builder

    File c:\Users\dell lattitude\anaconda3\envs\tsflow\lib\site-      packages\object_detection\builders\model_builder.py:22
         20 from object_detection.builders import anchor_generator_builder
         21 from object_detection.builders import box_coder_builder
    ---> 22 from object_detection.builders import box_predictor_builder
         23 from object_detection.builders import hyperparams_builder
         24 from object_detection.builders import image_resizer_builder

     File c:\Users\dell lattitude\anaconda3\envs\tsflow\lib\site-     packages\object_detection\builders\box_predictor_builder.py:28
         26 from object_detection.predictors.heads import keras_box_head
         27 from object_detection.predictors.heads import keras_class_head
    ---> 28 from object_detection.predictors.heads import mask_head
         29 from object_detection.protos import box_predictor_pb2
         32 def build_convolutional_box_predictor(is_training,
         33                                       num_classes,
         34                                       conv_hyperparams_fn,
       (...)
         44                                       class_prediction_bias_init=0.0,
         45                                       use_depthwise=False,):
    ...
         34   Please refer to Mask RCNN paper:
         35   https://arxiv.org/abs/1703.06870
         36   """

    AttributeError: module 'tensorflow' has no attribute 'contrib'

I tried using tf_updatev2, that didn't work. also tried manually replacing files with tf.compat.v1.estimator since that's supposed to work in tfv2.xxx