Remove some unused imports.

comfy/ldm/modules/attention.py

-from inspect import isfunction
 import math
 import torch
 import torch.nn.functional as F
 from torch import nn, einsum
 from einops import rearrange, repeat
 from typing import Optional, Any
-from functools import partial
-
 
 from .diffusionmodules.util import checkpoint, AlphaBlender, timestep_embedding
 from .sub_quadratic_attention import efficient_dot_product_attention

comfy/ldm/modules/diffusionmodules/openaimodel.py

 from abc import abstractmethod
-import math
 
-import numpy as np
 import torch as th
 import torch.nn as nn
 import torch.nn.functional as F
 from einops import rearrange
-from functools import partial
 
 from .util import (
     checkpoint,

comfy/samplers.py

 from .k_diffusion import sampling as k_diffusion_sampling
 from .extra_samplers import uni_pc
 import torch
-import enum
 import collections
 from comfy import model_management
 import math
-from comfy import model_base
-import comfy.utils
-import comfy.conds
 
 def get_area_and_mult(conds, x_in, timestep_in):
     area = (x_in.shape[2], x_in.shape[3], 0, 0)