diff --git a/README.md b/README.md
index 76ad91c..9418e56 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,10 @@ TODO: write this section
 
 ## Installation
 
-`k-diffusion` can be installed via PyPI (`pip install k-diffusion`) but it will not include training and inference scripts, only library code that others can depend on. To run the training and inference scripts, clone this repository and run `pip install -e <path to repository>`.
+`k-diffusion` can be installed via PyPI (`pip install k-diffusion`) but it will not include training and inference scripts, only library code that others can depend on.
+
+To run the training and inference scripts, clone this repository and run `pip install -e <path to repository>[train]`
+(to install with the `train` extra that includes additional libraries required for training).
 
 ## Training
 
diff --git a/k_diffusion/augmentation.py b/k_diffusion/augmentation.py
index 920ef86..581e86c 100644
--- a/k_diffusion/augmentation.py
+++ b/k_diffusion/augmentation.py
@@ -3,7 +3,10 @@
 import operator
 
 import numpy as np
-from skimage import transform
+try:
+    import skimage.transform as skt
+except ImportError:
+    skt = None
 import torch
 from torch import nn
 
@@ -31,6 +34,8 @@ def rotate2d(theta):
 
 class KarrasAugmentationPipeline:
     def __init__(self, a_prob=0.12, a_scale=2**0.2, a_aniso=2**0.2, a_trans=1/8, disable_all=False):
+        if not skt:
+            raise ImportError('Please install scikit-image to use KarrasAugmentationPipeline')
         self.a_prob = a_prob
         self.a_scale = a_scale
         self.a_aniso = a_aniso
@@ -78,9 +83,9 @@ def __call__(self, image):
         image_orig = np.array(image, dtype=np.float32) / 255
         if image_orig.ndim == 2:
             image_orig = image_orig[..., None]
-        tf = transform.AffineTransform(mat.numpy())
+        tf = skt.AffineTransform(mat.numpy())
         if not self.disable_all:
-            image = transform.warp(image_orig, tf.inverse, order=3, mode='reflect', cval=0.5, clip=False, preserve_range=True)
+            image = skt.warp(image_orig, tf.inverse, order=3, mode='reflect', cval=0.5, clip=False, preserve_range=True)
         else:
             image = image_orig
             cond = torch.zeros_like(cond)
diff --git a/k_diffusion/evaluation.py b/k_diffusion/evaluation.py
index d7cf37c..da0c888 100644
--- a/k_diffusion/evaluation.py
+++ b/k_diffusion/evaluation.py
@@ -2,7 +2,6 @@
 import os
 from pathlib import Path
 
-from cleanfid.inception_torchscript import InceptionV3W
 import clip
 import torch
 from torch import nn
@@ -16,6 +15,10 @@
 class InceptionV3FeatureExtractor(nn.Module):
     def __init__(self, device='cpu'):
         super().__init__()
+        try:
+            from cleanfid.inception_torchscript import InceptionV3W
+        except ImportError as ie:
+            raise ImportError('Please install clean-fid to use InceptionV3FeatureExtractor') from ie
         path = Path(os.environ.get('XDG_CACHE_HOME', Path.home() / '.cache')) / 'k-diffusion'
         url = 'https://nvlabs-fi-cdn.nvidia.com/stylegan2-ada-pytorch/pretrained/metrics/inception-2015-12-05.pt'
         digest = 'f58cb9b6ec323ed63459aa4fb441fe750cfe39fafad6da5cb504a16f19e958f4'
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index c62792c..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-accelerate
-clean-fid
-clip-anytorch
-dctorch
-einops
-jsonmerge
-kornia
-Pillow
-safetensors
-scikit-image
-scipy
-torch>=2.1
-torchdiffeq
-torchsde
-torchvision
-tqdm
-wandb
diff --git a/setup.cfg b/setup.cfg
index 1e73b1f..5c14bc3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -11,9 +11,8 @@ license = MIT
 
 [options]
 packages = find:
-install_requires = 
+install_requires =
     accelerate
-    clean-fid
     clip-anytorch
     dctorch
     einops
@@ -21,11 +20,15 @@ install_requires =
     kornia
     Pillow
     safetensors
-    scikit-image
     scipy
     torch >= 2.1
     torchdiffeq
     torchsde
     torchvision
     tqdm
+
+[options.extras_require]
+train =
+    clean-fid
+    scikit-image
     wandb