tf_slim error in Step 7 of loading trained model from checkpoint

[AmartyaCSB]

Hi, I am trying to run step 7 in the tutorial.
This line is giving me an error:
from object_detection.builders import model_builder

It throws an error:

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-067428168487> in <module>
      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

~/RealTimeObjectDetection/object_detection/builders/model_builder.py in <module>
     21 from absl import logging
     22 
---> 23 from object_detection.builders import anchor_generator_builder
     24 from object_detection.builders import box_coder_builder
     25 from object_detection.builders import box_predictor_builder

~/RealTimeObjectDetection/object_detection/builders/anchor_generator_builder.py in <module>
     21 from __future__ import print_function
     22 from six.moves import zip
---> 23 from object_detection.anchor_generators import flexible_grid_anchor_generator
     24 from object_detection.anchor_generators import grid_anchor_generator
     25 from object_detection.anchor_generators import multiple_grid_anchor_generator

~/RealTimeObjectDetection/object_detection/anchor_generators/flexible_grid_anchor_generator.py in <module>
     17 import tensorflow.compat.v1 as tf
     18 
---> 19 from object_detection.anchor_generators import grid_anchor_generator
     20 from object_detection.core import anchor_generator
     21 from object_detection.core import box_list_ops

~/RealTimeObjectDetection/object_detection/anchor_generators/grid_anchor_generator.py in <module>
     25 from object_detection.core import anchor_generator
     26 from object_detection.core import box_list
---> 27 from object_detection.utils import ops
     28 
     29 

~/RealTimeObjectDetection/object_detection/utils/ops.py in <module>
     26 from six.moves import zip
     27 import tensorflow.compat.v1 as tf
---> 28 import tf_slim
     29 from object_detection.core import standard_fields as fields
     30 from object_detection.utils import shape_utils

**ModuleNotFoundError: No module named 'tf_slim'**

Upon Inspection, I found that tf slim has to be pip installed which I did. But it still throws an error. I am using Tensorflow 2.3 as required in this tutorial. Please help as I am stuck with the inference!