Demo and show image of demo.py

[toandaominh1997]

• Demo
• Load model
• Demo readme

[pep8speaks]

Hello @toandaominh1997! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file demo.py:

Line 26:80: E501 line too long (87 > 79 characters) Line 46:54: E225 missing whitespace around operator Line 55:80: E501 line too long (81 > 79 characters) Line 56:59: E231 missing whitespace after ',' Line 56:80: E501 line too long (113 > 79 characters) Line 60:28: E251 unexpected spaces around keyword / parameter equals Line 60:30: E251 unexpected spaces around keyword / parameter equals Line 61:80: E501 line too long (81 > 79 characters)

• In the file models/efficientdet.py:

Line 57:41: E225 missing whitespace around operator

• In the file train.py:

Line 70:1: E302 expected 2 blank lines, found 1 Line 90:80: E501 line too long (82 > 79 characters)