Image Sampling from Saved Model Weights (Addresses Issue #353)

[balakrish181]

Summary:

• Created the sampler.py script to allow users to generate images from pre-trained model weights.
• This change directly addresses Issue How to generate images through trained model files？ #353 where users asked how to use the trained model files (.pt) to generate images.
• The new script makes it easy to generate images using saved model checkpoints (e.g., model-{epoch}.pt).

Changes:

• Added the sampler.py script for image generation from trained models.
• Provided clear argument handling to allow users to specify the number of images, batch size, image size, and checkpoint to load.
• Updated markdown documentation to reflect usage instructions and examples, ensuring clarity for end-users.

Issue Resolved:

• Issue How to generate images through trained model files？ #353: Users can now generate images using saved model checkpoints.