Bug fix for ptq_generate, add functional test for ptq and ptq_generate

[yueshen2016]

What does this PR do ?

Fix a bug for ptq_generate, and add functional test for ptq and ptq_generate

Changelog

• Add specific line by line info of high level changes in this PR.

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[yueshen2016]

/ok to test fe7fde9

[yueshen2016]

/ok to test fe21a86

[yueshen2016]

/ok to test 1c5aa7d

[yueshen2016]

/ok to test 6da9242

[yueshen2016]

/ok to test f6c38a3