diff --git a/perceptor/models/open_clip.py b/perceptor/models/open_clip.py
index 4fcb83b..19578fd 100644
--- a/perceptor/models/open_clip.py
+++ b/perceptor/models/open_clip.py
@@ -51,8 +51,6 @@ def __init__(
         if (architecture, weights) not in open_clip.list_pretrained():
             raise ValueError(f"Invalid architecture/weights: {architecture}/{weights}")
 
-        pretrained_cfg = open_clip.pretrained.get_pretrained_cfg(architecture, weights)
-
         # softmax on cpu does not support half precision
         start_device = (
             torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
diff --git a/perceptor/models/velocity_diffusion/velocity_diffusion.py b/perceptor/models/velocity_diffusion/velocity_diffusion.py
index 5626cf5..4d4ef34 100644
--- a/perceptor/models/velocity_diffusion/velocity_diffusion.py
+++ b/perceptor/models/velocity_diffusion/velocity_diffusion.py
@@ -142,6 +142,26 @@ def diffuse(self, denoised_images, ts, noise=None):
         alphas, sigmas = self.alphas(ts), self.sigmas(ts)
         return diffusion_space.decode(denoised_xs * alphas + noise * sigmas)
 
+    def inject_noise(
+        self, diffused_images, ts, reversed_ts, extra_noise_multiplier=1.003
+    ):
+        diffused_xs = diffusion_space.encode(diffused_images).to(self.device)
+
+        diffused_multiplier = self.alphas(reversed_ts) / self.alphas(ts)
+        target_sigmas = self.sigmas(reversed_ts)
+        additional_noise_std = (
+            target_sigmas.square()
+            - self.sigmas(ts).square() * diffused_multiplier.square()
+        ).sqrt()
+
+        reversed_diffused_xs = (
+            diffused_xs * diffused_multiplier
+            + additional_noise_std
+            * torch.randn_like(diffused_xs)
+            * extra_noise_multiplier
+        )
+        return diffusion_space.decode(reversed_diffused_xs)
+
 
 VelocityDiffusion: Model = cache(Model)
 
diff --git a/perceptor/utils/gradient_checkpoint.py b/perceptor/utils/gradient_checkpoint.py
index 9d15e87..feaa3b6 100644
--- a/perceptor/utils/gradient_checkpoint.py
+++ b/perceptor/utils/gradient_checkpoint.py
@@ -1,4 +1,5 @@
 from lantern import FunctionalBase, Tensor
+import torch
 
 
 class GradientCheckpoint(FunctionalBase):
@@ -8,18 +9,50 @@ class GradientCheckpoint(FunctionalBase):
     def __init__(self, tensor):
         super().__init__(original=tensor, detached=tensor.detach().requires_grad_())
 
-    def continue_backward(self, retain_graph=False):
-        if self.grad is None:
+    def zero_grad_(self):
+        self.detached.grad.zero_()
+        return self
+
+    def backward(self, loss):
+        loss.backward()
+        gradients = self.detached.grad.clone()
+        self.zero_grad_()
+        return gradients
+
+    def continue_backward(self, gradients=None, retain_graph=False):
+        if self.detached.grad is None:
             raise ValueError("Gradient is not defined")
-        return self.original.backward(self.detached.grad, retain_graph=retain_graph)
 
-    @property
-    def grad(self):
-        return self.detached.grad
+        if gradients is None:
+            return self.original.backward(self.detached.grad, retain_graph=retain_graph)
+        else:
+            return self.original.backward(gradients, retain_graph=retain_graph)
 
     def tensor(self):
         return self.detached
 
+    @staticmethod
+    def nonzero_mean(gradients, dim=0):
+        if isinstance(gradients, list):
+            gradients = torch.stack(gradients)
+        return gradients.sum(dim).div(gradients.ne(0).sum(dim).add(1e-6))
+
+    @staticmethod
+    def nonzero_scale(tensor, dim=None):
+        if isinstance(tensor, list):
+            tensor = torch.stack(tensor)
+        shape = tensor.shape
+        if dim is None:
+            tensor = tensor.flatten()
+            dim = 0
+
+        mask = tensor.ne(0)
+        mean_square = tensor.square().sum(dim) / mask.sum(dim).add(1e-6)
+        mean = tensor.sum(dim) / mask.sum(dim).add(1e-6)
+        std = (mean_square - mean.square()).sqrt().add(1e-6)
+        scaled_tensor = tensor / std.unsqueeze(dim).add(1e-6)
+        return scaled_tensor.view(*shape)
+
 
 def gradient_checkpoint(tensor: Tensor) -> GradientCheckpoint:
     """
@@ -42,6 +75,6 @@ def test_gradient_checkpoint():
         images = torch.zeros(1, 3, 64, 64).requires_grad_()
         checkpoint = gradient_checkpoint(images * 2)
         checkpoint.tensor().pow(2).mean().backward()
-        assert checkpoint.grad is not None
+        assert checkpoint.detached.grad is not None
         checkpoint.continue_backward()
     assert images.grad is not None
diff --git a/poetry.lock b/poetry.lock
index 2c318af..2824cd7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -16,7 +16,7 @@ python-versions = "*"
 
 [[package]]
 name = "aiohttp"
-version = "3.8.1"
+version = "3.8.3"
 description = "Async http client/server framework (asyncio)"
 category = "main"
 optional = false
@@ -123,10 +123,10 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-tests_no_zope = ["cloudpickle", "pytest-mypy-plugins", "mypy (>=0.900,!=0.940)", "pytest (>=4.3.0)", "pympler", "hypothesis", "coverage[toml] (>=5.0.2)"]
-tests = ["cloudpickle", "zope.interface", "pytest-mypy-plugins", "mypy (>=0.900,!=0.940)", "pytest (>=4.3.0)", "pympler", "hypothesis", "coverage[toml] (>=5.0.2)"]
-docs = ["sphinx-notfound-page", "zope.interface", "sphinx", "furo"]
-dev = ["cloudpickle", "pre-commit", "sphinx-notfound-page", "sphinx", "furo", "zope.interface", "pytest-mypy-plugins", "mypy (>=0.900,!=0.940)", "pytest (>=4.3.0)", "pympler", "hypothesis", "coverage[toml] (>=5.0.2)"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
 
 [[package]]
 name = "backcall"
@@ -224,7 +224,7 @@ python-versions = "~=3.7"
 
 [[package]]
 name = "certifi"
-version = "2022.9.14"
+version = "2022.9.24"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
@@ -389,15 +389,18 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "executing"
-version = "1.0.0"
+version = "1.1.0"
 description = "Get the currently executing AST node of a frame, and other information"
 category = "dev"
 optional = false
 python-versions = "*"
 
+[package.extras]
+tests = ["rich", "littleutils", "pytest", "asttokens"]
+
 [[package]]
 name = "fastjsonschema"
-version = "2.16.1"
+version = "2.16.2"
 description = "Fastest Python implementation of JSON schema"
 category = "dev"
 optional = false
@@ -415,8 +418,8 @@ optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-testing = ["pytest-timeout (>=2.1)", "pytest-cov (>=3)", "pytest (>=7.1.2)", "coverage (>=6.4.2)", "covdefaults (>=2.2)"]
-docs = ["sphinx-autodoc-typehints (>=1.19.1)", "sphinx (>=5.1.1)", "furo (>=2022.6.21)"]
+docs = ["furo (>=2022.6.21)", "sphinx (>=5.1.1)", "sphinx-autodoc-typehints (>=1.19.1)"]
+testing = ["covdefaults (>=2.2)", "coverage (>=6.4.2)", "pytest (>=7.1.2)", "pytest-cov (>=3)", "pytest-timeout (>=2.1)"]
 
 [[package]]
 name = "flake8"
@@ -441,7 +444,7 @@ python-versions = "*"
 
 [[package]]
 name = "fonttools"
-version = "4.37.2"
+version = "4.37.3"
 description = "Tools to manipulate font files"
 category = "main"
 optional = false
@@ -525,7 +528,7 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "google-auth"
-version = "2.11.0"
+version = "2.11.1"
 description = "Google Authentication Library"
 category = "main"
 optional = false
@@ -560,7 +563,7 @@ tool = ["click (>=6.0.0)"]
 
 [[package]]
 name = "grpcio"
-version = "1.49.0"
+version = "1.49.1"
 description = "HTTP/2-based RPC framework"
 category = "main"
 optional = false
@@ -570,7 +573,7 @@ python-versions = ">=3.7"
 six = ">=1.5.2"
 
 [package.extras]
-protobuf = ["grpcio-tools (>=1.49.0)"]
+protobuf = ["grpcio-tools (>=1.49.1)"]
 
 [[package]]
 name = "huggingface-hub"
@@ -618,7 +621,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "imageio"
-version = "2.21.3"
+version = "2.22.0"
 description = "Library for reading and writing a wide range of image, video, scientific, and volumetric data formats."
 category = "main"
 optional = false
@@ -692,8 +695,8 @@ python-versions = ">=3.7"
 zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
-testing = ["pytest-mypy (>=0.9.1)", "pytest-black (>=0.3.7)", "pytest-enabler (>=1.3)", "pytest-cov", "pytest-flake8", "pytest-checkdocs (>=2.4)", "pytest (>=6)"]
-docs = ["jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "jaraco.packaging (>=9)", "sphinx"]
+docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "jaraco.tidelift (>=1.4)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
 
 [[package]]
 name = "iniconfig"
@@ -787,7 +790,7 @@ traitlets = ">=4.3.1"
 widgetsnbextension = ">=3.6.0,<3.7.0"
 
 [package.extras]
-test = ["pytest (>=3.6.0)", "pytest-cov", "mock"]
+test = ["mock", "pytest-cov", "pytest (>=3.6.0)"]
 
 [[package]]
 name = "jedi"
@@ -945,10 +948,10 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*"
 
 [package.extras]
-source = ["Cython (>=0.29.7)"]
-htmlsoup = ["beautifulsoup4"]
-html5 = ["html5lib"]
 cssselect = ["cssselect (>=0.7)"]
+html5 = ["html5lib"]
+htmlsoup = ["beautifulsoup4"]
+source = ["Cython (>=0.29.7)"]
 
 [[package]]
 name = "markdown"
@@ -1111,7 +1114,7 @@ webpdf = ["pyppeteer (>=1,<1.1)"]
 
 [[package]]
 name = "nbformat"
-version = "5.5.0"
+version = "5.6.0"
 description = "The Jupyter Notebook format"
 category = "dev"
 optional = false
@@ -1120,11 +1123,11 @@ python-versions = ">=3.7"
 [package.dependencies]
 fastjsonschema = "*"
 jsonschema = ">=2.6"
-jupyter_core = "*"
+jupyter-core = "*"
 traitlets = ">=5.1"
 
 [package.extras]
-test = ["check-manifest", "testpath", "pytest", "pre-commit", "pep440"]
+test = ["check-manifest", "pep440", "pre-commit", "pytest", "testpath"]
 
 [[package]]
 name = "nest-asyncio"
@@ -1314,7 +1317,7 @@ pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 
 [[package]]
 name = "pandas"
-version = "1.4.4"
+version = "1.5.0"
 description = "Powerful data structures for data analysis, time series, and statistics"
 category = "main"
 optional = false
@@ -1322,16 +1325,14 @@ python-versions = ">=3.8"
 
 [package.dependencies]
 numpy = [
-    {version = ">=1.18.5", markers = "platform_machine != \"aarch64\" and platform_machine != \"arm64\" and python_version < \"3.10\""},
-    {version = ">=1.19.2", markers = "platform_machine == \"aarch64\" and python_version < \"3.10\""},
-    {version = ">=1.20.0", markers = "platform_machine == \"arm64\" and python_version < \"3.10\""},
     {version = ">=1.21.0", markers = "python_version >= \"3.10\""},
+    {version = ">=1.20.3", markers = "python_version < \"3.10\""},
 ]
 python-dateutil = ">=2.8.1"
 pytz = ">=2020.1"
 
 [package.extras]
-test = ["hypothesis (>=5.5.3)", "pytest (>=6.0)", "pytest-xdist (>=1.31)"]
+test = ["pytest-xdist (>=1.31)", "pytest (>=6.0)", "hypothesis (>=5.5.3)"]
 
 [[package]]
 name = "pandocfilters"
@@ -1683,7 +1684,7 @@ tqdm = ">=4.51.0,<5.0.0"
 
 [[package]]
 name = "pytorch-lightning"
-version = "1.7.6"
+version = "1.7.7"
 description = "PyTorch Lightning is the lightweight PyTorch wrapper for ML researchers. Scale your models. Write less boilerplate."
 category = "main"
 optional = false
@@ -1716,7 +1717,7 @@ test = ["coverage (>=6.4)", "codecov (>=2.1)", "pytest (>=7.0)", "pytest-cov", "
 
 [[package]]
 name = "pytorch-zero-lit"
-version = "0.2.1"
+version = "0.2.2"
 description = "LiT: Zero-Shot Transfer with Locked-image text Tuning"
 category = "main"
 optional = false
@@ -1775,7 +1776,7 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "pyzmq"
-version = "24.0.0"
+version = "24.0.1"
 description = "Python bindings for 0MQ"
 category = "dev"
 optional = false
@@ -1945,7 +1946,7 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "stack-data"
-version = "0.5.0"
+version = "0.5.1"
 description = "Extract data from python stack frames and tracebacks for informative displays"
 category = "dev"
 optional = false
@@ -1988,7 +1989,7 @@ tqdm = "*"
 
 [[package]]
 name = "tb-nightly"
-version = "2.11.0a20220918"
+version = "2.11.0a20220925"
 description = "TensorBoard lets you watch Tensors Flow"
 category = "main"
 optional = false
@@ -2001,7 +2002,7 @@ google-auth-oauthlib = ">=0.4.1,<0.5"
 grpcio = ">=1.24.3"
 markdown = ">=2.6.8"
 numpy = ">=1.12.0"
-protobuf = ">=3.9.2,<3.20"
+protobuf = ">=3.9.2,<4"
 requests = ">=2.21.0,<3"
 tensorboard-data-server = ">=0.6.0,<0.7.0"
 tensorboard-plugin-wit = ">=1.6.0"
@@ -2072,7 +2073,7 @@ python-versions = ">=3.8"
 numpy = ">=1.19.2"
 
 [package.extras]
-all = ["lxml", "matplotlib (>=3.3)", "imagecodecs (>=2022.2.22)"]
+all = ["imagecodecs (>=2022.2.22)", "matplotlib (>=3.3)", "lxml"]
 
 [[package]]
 name = "timm"
@@ -2386,7 +2387,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "ffb3d8455eb30ae78373d2d6e7f5053dd5d771cb373dd6580e615f2b0d3fba9b"
+content-hash = "ea239d17aab9ba06087dfde7728a354c39c8f74f238077dc57560c670e432a44"
 
 [metadata.files]
 absl-py = []
@@ -2394,87 +2395,12 @@ addict = [
     {file = "addict-2.4.0-py3-none-any.whl", hash = "sha256:249bb56bbfd3cdc2a004ea0ff4c2b6ddc84d53bc2194761636eb314d5cfa5dfc"},
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 ]
-aiohttp = [
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 click = [
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@@ -2601,10 +2592,7 @@ imgaug = [
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 importlib-resources = []
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@@ -3098,10 +3086,7 @@ send2trash = [
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@@ -3199,14 +3184,23 @@ torchvision = [
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 ]
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 tqdm = []
 traitlets = []
 transformers = []
-typing-extensions = [
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 urllib3 = []
 wcwidth = [
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diff --git a/pyproject.toml b/pyproject.toml
index d33de28..2304f64 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "perceptor"
-version = "0.5.14"
+version = "0.5.15"
 description = "Modular image generation library"
 authors = ["Richard Löwenström <samedii@gmail.com>", "dribnet"]
 readme = "README.md"
@@ -32,7 +32,7 @@ pytorch-lantern = "^0.12.0"
 taming-transformers-rom1504 = "^0.0.6"
 diffusers = "^0.2.4"
 open-clip-torch = "^2.0.2"
-pytorch-zero-lit = "^0.2.1"
+pytorch-zero-lit = "^0.2.2"
 
 [tool.poetry.dev-dependencies]
 ipykernel = "^6.8.0"