ValueError: Shape must be rank 1 but is rank 2 for 'strided_slice' (op: 'StridedSlice') with input shapes: [?,3], [1,7], [1,7], [1].

[Shafaq-S]

I'm trying to implement this code (not on colab) with tf 1.10 and keras 2.2.2. I have managed to run data-processing.py but taining.py gives the following error:

Traceback (most recent call last):
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 1576, in _create_c_op
c_op = c_api.TF_FinishOperation(op_desc)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Shape must be rank 1 but is rank 2 for 'strided_slice' (op: 'StridedSlice') with input shapes: [?,3], [1,7], [1,7], [1].

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "training.py", line 189, in
train_classes = classes[index[0:7]]
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/ops/array_ops.py", line 524, in _slice_helper
name=name)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/ops/array_ops.py", line 690, in strided_slice
shrink_axis_mask=shrink_axis_mask)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/ops/gen_array_ops.py", line 8232, in strided_slice
name=name)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/framework/op_def_library.py", line 787, in _apply_op_helper
op_def=op_def)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/util/deprecation.py", line 454, in new_func
return func(*args, **kwargs)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 3155, in create_op
op_def=op_def)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 1731, in init
control_input_ops)
File "/home/ms-thesis/.local/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 1579, in _create_c_op
raise ValueError(str(e))
ValueError: Shape must be rank 1 but is rank 2 for 'strided_slice' (op: 'StridedSlice') with input shapes: [?,3], [1,7], [1,7], [1].

I have tried reshaping the tensor but that also does not work. Suggestions would be appreciated.