feat(llm): respect warnings environment for dtype warning (#664)

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

openllm-python/src/openllm/_llm.py

@@ -76,6 +76,10 @@ def normalise_model_name(name: str) -> str:
 
 
 def _resolve_peft_config_type(adapter_map: dict[str, str]) -> AdapterMap:
+  if not is_peft_available():
+    raise RuntimeError(
+      "LoRA adapter requires 'peft' to be installed. Make sure to do 'pip install \"openllm[fine-tune]\"'"
+    )
   try:
     from huggingface_hub import hf_hub_download
   except ImportError:
@@ -174,19 +178,11 @@ class LLM(t.Generic[M, T], ReprMixin):
     backend = first_not_none(backend, os.getenv('OPENLLM_BACKEND'), default='vllm' if is_vllm_available() else 'pt')
     torch_dtype = first_not_none(os.getenv('TORCH_DTYPE'), torch_dtype, default='auto')
     quantize = first_not_none(quantize, os.getenv('OPENLLM_QUANTIZE'), default=None)
-    # elif quantization_config is None and quantize is not None:
-    #   quantization_config, attrs = infer_quantisation_config(self, quantize, **attrs)
     attrs.update({'low_cpu_mem_usage': low_cpu_mem_usage})
 
     # parsing tokenizer and model kwargs, as the hierarchy is param pass > default
     model_attrs, tokenizer_attrs = flatten_attrs(**attrs)
 
-    if adapter_map is not None and not is_peft_available():
-      raise RuntimeError(
-        "LoRA adapter requires 'peft' to be installed. Make sure to do 'pip install \"openllm[fine-tune]\"'"
-      )
-    if isinstance(prompt_template, str):
-      prompt_template = PromptTemplate(prompt_template)
     if model_tag is None:
       model_tag, model_version = self._make_tag_components(model_id, model_version, backend=backend)
       if model_version:
@@ -202,7 +198,7 @@ class LLM(t.Generic[M, T], ReprMixin):
       adapter_map=_resolve_peft_config_type(adapter_map) if adapter_map is not None else None,
       serialisation=serialisation,
       local=_local,
-      prompt_template=prompt_template,
+      prompt_template=PromptTemplate(prompt_template) if isinstance(prompt_template, str) else prompt_template,
       system_message=system_message,
       LLM__model_attrs=model_attrs,
       LLM__tokenizer_attrs=tokenizer_attrs,
@@ -243,7 +239,7 @@ class LLM(t.Generic[M, T], ReprMixin):
       if config_dtype is None:
         config_dtype = torch.float32
       if not torch.cuda.is_available():
-        if self.__llm_torch_dtype__ in {'auto', 'half'}:
+        if self.__llm_torch_dtype__ in {'auto', 'half'} and not get_disable_warnings() and not get_quiet_mode():
           logger.warning('"auto" and "half" are not supported on CPU. OpenLLM will default fallback to "float32".')
         torch_dtype = torch.float32  # we need to cast back to full precision if cuda is not available
       elif self.__llm_torch_dtype__ == 'auto':