feat: remove bias, change ReLU to SwiGLU

feat: add wandb in train.py

feat: add temperature and top_k arguments in generate

feat: add argparser for sample.py

update README.md

feat: modify log info in train.py

feat: replace pos_embedding with RoPE in MHA

feat: add job id in filename of checkpoint

feat: add tqdm for train.py

feat: add info log for sample.py

fix: delete redundant <endoftext>

feat: modify train.py to load data with np.memmap

feat: add prepare.py

feat: add weight tying

feat: LayerNorm -> RMSNorm, and add RoPE