Add dtype selection to T5

utils/lookup.py

@@ -0,0 +1,56 @@
+import torch
+from comfy import model_management
+
+dtype_list_torch = [
+	"FP32",
+	"FP16",
+	# "FP8 E4M3", # ToDo: add these
+	# "FP8 E5M2",
+]
+
+dtype_list_short = [
+	"auto",
+	*dtype_list_torch,
+]
+
+dtype_list = [
+	"default",
+	"auto (comfy)",
+	*dtype_list_torch,
+	"bnb8bit",
+	"bnb4bit"
+]
+
+def string_to_dtype(s="none", mode=None):
+	s = s.lower().strip()
+	if s in ["default", "as-is"]:
+		return None
+	elif s in ["auto", "auto (comfy)"]:
+		if mode == "vae":
+			return model_management.vae_device()
+		elif mode == "text_encoder":
+			return model_management.text_encoder_dtype()
+		elif mode == "unet":
+			return model_management.unet_dtype()
+		else:
+			raise NotImplementedError(f"Unknown dtype mode '{mode}'")
+	elif s in ["none", "auto (hf)", "auto (hf/bnb)"]:
+		return None
+	elif s in ["fp32", "float32", "float"]:
+		return torch.float32
+	elif s in ["fp16", "float16", "half"]:
+		return torch.float16
+	elif "fp8" in s or "float8" in s:
+		if "e5m2" in s:
+			return torch.float8_e5m2
+		elif "e4m3" in s:
+			return torch.float8_e4m3fn
+		else:
+			raise NotImplementedError(f"Unknown 8bit dtype '{s}'")
+	elif "bnb" in s:
+		assert s in ["bnb8bit", "bnb4bit"], f"Unknown bnb mode '{s}'"
+		return s
+	elif s is None:
+		return None
+	else:
+		raise NotImplementedError(f"Unknown dtype '{s}'")