fix tokenizer matching and add tests

model/supervised_finetuning/utils.py

@@ -37,7 +37,7 @@ TOKENIZER_CONFIGS = {
 
 def match_tokenizer_name(model_name: str) -> TokenizerConfig:
     """Match a partial model name to a tokenizer configuration"""
-    tokenizer_config_matches = [config for name, config in TOKENIZER_CONFIGS.items() if name in model_name]
+    tokenizer_config_matches = [config for name, config in TOKENIZER_CONFIGS.items() if model_name in name]
     if not tokenizer_config_matches:
         raise ValueError(f"Cannot find any tokeniser configuration to match {model_name=}")
     elif 1 < len(tokenizer_config_matches):