[Oneshot Refactor] Rename get_shared_processor_src to get_processor_n…

…ame_from_model (#1108)

ORDER OF REVIEWS:
1. #1108 <- current
PR
2. #1103
3. #1109
4. #1110

SUMMARY:
* Rename `get_shared_processor_src` to `get_processor_from_model`
* Appropriate signature on `initialize_processor_from_path`, where
`teacher` should be optinal


TEST PLAN:
* Pass all existing tests
* Search `get_shared_processor_src` using pygrep
```bash
  3 function pygrep() {
  2     local search_term="$1"
  1     shift
126     local search_dirs="${*:-src examples tests}"                           
  1     grep -rn --include="*.py" -E "$search_term" $search_dirs
  2 }
```

---------

Co-authored-by: Dipika Sikka <dipikasikka1@gmail.com>

src/llmcompressor/transformers/finetune/text_generation.py

@@ -20,6 +20,7 @@
 import os
 import warnings
 from pathlib import PosixPath
+from typing import Optional
 
 from loguru import logger
 from transformers import (
@@ -51,7 +52,7 @@
     patch_tied_tensors_bug,
 )
 from llmcompressor.transformers.sparsification.sparse_model import (
-    get_shared_processor_src,
+    get_processor_name_from_model,
 )
 from llmcompressor.transformers.utils.helpers import (
     detect_last_checkpoint,
@@ -257,10 +258,13 @@ def initialize_model_from_path(
 
 
 def initialize_processor_from_path(
-    model_args: ModelArguments, model: PreTrainedModel, teacher: PreTrainedModel
+    model_args: ModelArguments,
+    model: PreTrainedModel,
+    teacher: Optional[PreTrainedModel] = None,
 ) -> Processor:
-    processor_src = model_args.processor
-    processor_src = processor_src or get_shared_processor_src(model, teacher)
+    processor_src = model_args.processor or get_processor_name_from_model(
+        model, teacher
+    )
     # The use_fast=True option is not currently supported safely in Transformers
     # See: https://github.com/huggingface/transformers/pull/34836#issuecomment-2491809727  # noqa: E501
     try:

src/llmcompressor/transformers/sparsification/sparse_model.py

@@ -7,7 +7,7 @@
 
 __all__ = [
     "SparseAutoModelForCausalLM",
-    "get_shared_processor_src",
+    "get_processor_name_from_model",
 ]
 
 
@@ -20,7 +20,7 @@ def from_pretrained(*args, **kwargs):
         return AutoModelForCausalLM.from_pretrained(*args, **kwargs)
 
 
-def get_shared_processor_src(student: Module, teacher: Optional[Module]) -> str:
+def get_processor_name_from_model(student: Module, teacher: Optional[Module]) -> str:
     """
     Get a processor/tokenizer source used for both student and teacher, assuming
     that they could be shared