Remove unnecessary pins

[rahul003]

Description:

Issue #, sim, or t.corp if available:
As per internal ticket from Jeff

• Link to RTD for my changes: https://github.com/aws-neuron/aws-neuron-samples-staging/YOUR_BRANCH_NAME/

• Submitter Checklist

  • Tested on : Neuron SDK , release_version, Instance_type.

  • I've completely filled out the form above!
    **(MANDATORY) PR needs test run output

     * I have provided the output with expected metrics in a metrics.json file
    
     * I have attached metric.json in the PR
    
     * I have attached golden_step_loss.txt
    
     * I have added screen shot of plotted loss curve
    

    • (If applicable) I've automated a test to safegaurd my changes from regression.
    • (If applicable) I've posted test collateral to prove my change was effective and not harmful.
    • (If applicable) I've added someone from QA to the list of reviewers. Do this if you didn't make an automated test or feel it's appropriate for another reason.
    • (If applicable) I've reviewed the licenses of updated and new binaries and their dependencies to make sure all licenses are on the pre-approved Amazon license list.

• Reviewer Checklist
  * I've verified the changes render correctly on RTD (link above)
  * I've ensured the submitter completed the form
  * (If appropriate) I've verified the metrics.json file provided by the submitter

[ashokmon-aws]

Can you please add the testing results?