#245 Set download_model path extension to .pt

[illian01]

Description

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Closes: #245

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Change(s)

• Set download_model path extension to .pt
• They are in compress_model, recommendation_compression and recommendation_compression methods.

[illian01]

Sorry for reverting a commit. I didn't recognized there is FRAMEWORK_EXTENSION_MAP. I simply fixed FRAMEWORK_EXTENSION_MAP value, so that onnx file transformed to .pt