version check.

Author: sayakpaul

src/diffusers/loaders/lora_pipeline.py

@@ -25,6 +25,7 @@
     deprecate,
     get_adapter_name,
     get_peft_kwargs,
+    is_peft_available,
     is_peft_version,
     is_torch_version,
     is_transformers_available,
@@ -42,7 +43,12 @@
 
 
 if is_torch_version(">=", "1.9.0"):
-    if is_peft_version(">", "0.13.1") and is_transformers_version(">", "4.45.1"):
+    if (
+        is_peft_available()
+        and is_peft_version(">", "0.13.1")
+        and is_transformers_available()
+        and is_transformers_version(">", "4.45.1")
+    ):
         _LOW_CPU_MEM_USAGE_DEFAULT_LORA = True
 else:
     _LOW_CPU_MEM_USAGE_DEFAULT_LORA = False