config chooser, update readme instructions, device config, llama flash attention, debug out the labels, fix config key checks, other bugfixes

configs/cerebras_1_3B_alpaca.yml

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+base_model: cerebras/Cerebras-GPT-1.3B
+model_type: AutoModelForCausalLM
+tokenizer_type: AutoTokenizer
+load_in_8bit: true
+datasets:
+  - path: data/alpaca_data_gpt4.jsonl
+    type: alpaca
+  - path: data/vicuna_cleaned.jsonl
+    type: sharegpt
+  - path: data/gpt4-instruct-similarity-0.6-dataset.jsonl
+    type: gpteacher
+  - path: data/roleplay-similarity_0.6-instruct-dataset.jsonl
+    type: gpteacher
+val_set_size: 0.05
+adapter: lora
+sequence_len: 2048
+lora_r: 8
+lora_alpha: 16
+lora_dropout: 0.05
+lora_target_modules:
+  - c_attn
+lora_fan_in_fan_out: false
+wandb_project: pythia-1.4b-lora
+wandb_watch:
+wandb_run_name:
+wandb_log_model: checkpoint
+output_dir: ./lora-alpaca
+batch_size: 32
+micro_batch_size: 4
+num_epochs: 5
+learning_rate: 0.0003
+train_on_inputs: false
+group_by_length: false
+bf16: True
+tf32: True
+resume_from_checkpoint:
+local_rank:
+deepspeed: