Add ExLlama+LoRA support (#2756)

modules/LoRA.py

@@ -7,49 +7,79 @@ import modules.shared as shared
 from modules.logging_colors import logger
 from modules.models import reload_model
 
+
+def add_lora_to_model(lora_names):
+    if 'GPTQForCausalLM' in shared.model.__class__.__name__:
+        add_lora_autogptq(lora_names)
+    elif shared.model.__class__.__name__ == 'ExllamaModel':
+        add_lora_exllama(lora_names)
+    else:
+        add_lora_transformers(lora_names)
+
+
+def add_lora_exllama(lora_names):
+
+    try:
+        from repositories.exllama.lora import ExLlamaLora
+    except:
+        logger.error("Could not find the file repositories/exllama/lora.py. Make sure that exllama is cloned inside repositories/ and is up to date.")
+        return
+
+    if len(lora_names) == 0:
+        shared.model.generator.lora = None
+        shared.lora_names = []
+        return
+    else:
+        if len(lora_names) > 1:
+            logger.warning('ExLlama can only work with 1 LoRA at the moment. Only the first one in the list will be loaded.')
+
+        lora_path = Path(f"{shared.args.lora_dir}/{lora_names[0]}")
+        lora_config_path = lora_path / "adapter_config.json"
+        lora_adapter_path = lora_path / "adapter_model.bin"
+
+        logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join([lora_names[0]])))
+        lora = ExLlamaLora(shared.model.model, str(lora_config_path), str(lora_adapter_path))
+        shared.model.generator.lora = lora
+        shared.lora_names = [lora_names[0]]
+        return
+
+
+# Adapted from https://github.com/Ph0rk0z/text-generation-webui-testing
+def add_lora_autogptq(lora_names):
+
     try:
         from auto_gptq import get_gptq_peft_model
         from auto_gptq.utils.peft_utils import GPTQLoraConfig
-    has_auto_gptq_peft = True
     except:
-    has_auto_gptq_peft = False
-
-
-def add_lora_to_model(lora_names):
-    prior_set = set(shared.lora_names)
-    added_set = set(lora_names) - prior_set
-    removed_set = prior_set - set(lora_names)
-    shared.lora_names = list(lora_names)
-
-    is_autogptq = 'GPTQForCausalLM' in shared.model.__class__.__name__
-
-    # AutoGPTQ case. It doesn't use the peft functions.
-    # Copied from https://github.com/Ph0rk0z/text-generation-webui-testing
-    if is_autogptq:
-        if not has_auto_gptq_peft:
         logger.error("This version of AutoGPTQ does not support LoRA. You need to install from source or wait for a new release.")
         return
 
-        if len(prior_set) > 0:
+    if len(lora_names) == 0:
+        if len(shared.lora_names) > 0:
             reload_model()
 
-        if len(shared.lora_names) == 0:
+        shared.lora_names = []
         return
     else:
-            if len(shared.lora_names) > 1:
-                logger.warning('AutoGPTQ can only work with 1 LoRA at the moment. Only the first one in the list will be loaded')
+        if len(lora_names) > 1:
+            logger.warning('AutoGPTQ can only work with 1 LoRA at the moment. Only the first one in the list will be loaded.')
 
         peft_config = GPTQLoraConfig(
             inference_mode=True,
         )
 
-            lora_path = Path(f"{shared.args.lora_dir}/{shared.lora_names[0]}")
+        lora_path = Path(f"{shared.args.lora_dir}/{lora_names[0]}")
         logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join([lora_names[0]])))
         shared.model = get_gptq_peft_model(shared.model, peft_config, lora_path)
+        shared.lora_names = [lora_names[0]]
         return
 
-    # Transformers case
-    else:
+
+def add_lora_transformers(lora_names):
+    prior_set = set(shared.lora_names)
+    added_set = set(lora_names) - prior_set
+    removed_set = prior_set - set(lora_names)
+
     # If no LoRA needs to be added or removed, exit
     if len(added_set) == 0 and len(removed_set) == 0:
         return
@@ -68,7 +98,6 @@ def add_lora_to_model(lora_names):
         shared.model = shared.model.base_model.model
 
     if len(lora_names) > 0:
-            logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join(lora_names)))
         params = {}
         if not shared.args.cpu:
             params['dtype'] = shared.model.dtype
@@ -77,10 +106,13 @@ def add_lora_to_model(lora_names):
             elif shared.args.load_in_8bit:
                 params['device_map'] = {'': 0}
 
+        logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join(lora_names)))
         shared.model = PeftModel.from_pretrained(shared.model, Path(f"{shared.args.lora_dir}/{lora_names[0]}"), adapter_name=lora_names[0], **params)
         for lora in lora_names[1:]:
             shared.model.load_adapter(Path(f"{shared.args.lora_dir}/{lora}"), lora)
 
+        shared.lora_names = lora_names
+
         if not shared.args.load_in_8bit and not shared.args.cpu:
             shared.model.half()
             if not hasattr(shared.model, "hf_device_map"):

modules/exllama.py

@@ -3,11 +3,12 @@ from pathlib import Path
 
 from modules import shared
 from modules.logging_colors import logger
+from modules.relative_imports import RelativeImport
 
-sys.path.insert(0, str(Path("repositories/exllama")))
-from repositories.exllama.generator import ExLlamaGenerator
-from repositories.exllama.model import ExLlama, ExLlamaCache, ExLlamaConfig
-from repositories.exllama.tokenizer import ExLlamaTokenizer
+with RelativeImport("repositories/exllama"):
+    from generator import ExLlamaGenerator
+    from model import ExLlama, ExLlamaCache, ExLlamaConfig
+    from tokenizer import ExLlamaTokenizer
 
 
 class ExllamaModel:

modules/relative_imports.py

@@ -0,0 +1,13 @@
+import sys
+from pathlib import Path
+
+
+class RelativeImport:
+    def __init__(self, path):
+        self.import_path = Path(path)
+
+    def __enter__(self):
+        sys.path.insert(0, str(self.import_path))
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        sys.path.remove(str(self.import_path))