functorch is a prototype of JAX-like composable function transforms for PyTorch.



Why functorch? | Install guide | Transformations | Future Plans

functorch is a prototype of JAX-like composable FUNCtion transforms for pyTORCH.

It aims to provide composable vmap and grad transforms that work with PyTorch modules and PyTorch autograd with good eager-mode performance. Because this project requires some investment, we'd love to hear from and work with early adopters to shape the design. Please reach out on the issue tracker if you're interested in using this for your project.

Why composable function transforms?

There are a number of use cases that are tricky to do in PyTorch today:

  • computing per-sample-gradients (or other per-sample quantities)
  • running ensembles of models on a single machine
  • efficiently batching together tasks in the inner-loop of MAML
  • efficiently computing Jacobians and Hessians
  • efficiently computing batched Jacobians and Hessians

Composing vmap, grad, and vjp transforms allows us to express the above without designing a separate subsystem for each. This idea of composable function transforms comes from the JAX framework.



Follow the instructions in this Colab notebook


First, set up an environment. We will be installing a nightly PyTorch binary as well as functorch. If you're using conda, create a conda environment:

conda create --name functorch
conda activate functorch

If you wish to use venv instead:

python -m venv functorch-env
source functorch-env/bin/activate

Next, install one of the following following PyTorch nightly binaries. functorch works with any of these but a more recent nightly should work as well.

# For CUDA 10.2
pip install --pre torch==1.9.0.dev20210517 -f
# For CUDA 11.1
pip install --pre torch==1.9.0.dev20210517 -f
# For CPU-only build
pip install --pre torch==1.9.0.dev20210517 -f

Install functorch:

pip install --user "git+"

Run a quick sanity check in python:

>>> import torch
>>> from functorch import vmap
>>> x = torch.randn(3)
>>> y = vmap(torch.sin)(x)
>>> assert torch.allclose(y, x.sin())

From Source

functorch is a PyTorch C++ Extension module. To install,

  • Install PyTorch from source. functorch usually runs on the latest development version of PyTorch.
  • Run python install. You can use DEBUG=1 to compile in debug mode.

Then, try to run some tests to make sure all is OK:

pytest test/ -v
pytest test/ -v

What are the transforms?

Right now, we support the following transforms:

  • grad, vjp, jacrev
  • vmap

Furthermore, we have some utilities for working with PyTorch modules.

  • make_functional(model) takes a model and returns its weights and a function version of the model that has no state.
  • make_functional_with_buffers(model) takes a model and returns its weights and buffers and a function version of the model that has no state.


Note: vmap imposes restrictions on the code that it can be used on. For more details, please read its docstring.

vmap(func)(*inputs) is a transform that adds a dimension to all Tensor operations in func. vmap(func) returns a few function that maps func over some dimension (default: 0) of each Tensor in inputs.

vmap is useful for hiding batch dimensions: one can write a function func that runs on examples and then lift it to a function that can take batches of examples with vmap(func), leading to a simpler modeling experience:

>>> from functorch import vmap
>>> batch_size, feature_size = 3, 5
>>> weights = torch.randn(feature_size, requires_grad=True)
>>> def model(feature_vec):
>>>     # Very simple linear model with activation
>>>     assert feature_vec.dim() == 1
>>>     return
>>> examples = torch.randn(batch_size, feature_size)
>>> result = vmap(model)(examples)


grad(func)(*inputs) assumes func returns a single-element Tensor. It compute the gradients of the output of func w.r.t. to inputs[0].

>>> from functorch import grad
>>> x = torch.randn([])
>>> cos_x = grad(lambda x: torch.sin(x))(x)
>>> assert torch.allclose(cos_x, x.cos())
>>> # Second-order gradients
>>> neg_sin_x = grad(grad(lambda x: torch.sin(x)))(x)
>>> assert torch.allclose(neg_sin_x, -x.sin())

When composed with vmap, grad can be used to compute per-sample-gradients:

>>> from functorch import vmap
>>> batch_size, feature_size = 3, 5
>>> def model(weights,feature_vec):
>>>     # Very simple linear model with activation
>>>     assert feature_vec.dim() == 1
>>>     return
>>> def compute_loss(weights, example, target):
>>>     y = model(weights, example)
>>>     return ((y - target) ** 2).mean()  # MSELoss
>>> weights = torch.randn(feature_size, requires_grad=True)
>>> examples = torch.randn(batch_size, feature_size)
>>> targets = torch.randn(batch_size)
>>> inputs = (weights,examples, targets)
>>> grad_weight_per_example = vmap(grad(compute_loss), in_dims=(None, 0, 0))(*inputs)

vjp and jacrev

>>> from functorch import vjp
>>> outputs, vjp_fn = vjp(func, inputs); vjps = vjp_fn(*cotangents)

The vjp transform applies func to inputs and returns a new function that computes vjps given some contangents Tensors.

>>> from functorch import jacrev
>>> x = torch.randn(5)
>>> jacobian = jacrev(torch.sin)(x)
>>> expected = torch.diag(x)
>>> assert torch.allclose(jacobian, expected)

Use jacrev to compute the jacobian. This can be composed with vmap to produce batched jacobians:

>>> x = torch.randn(64, 5)
>>> jacobian = vmap(jacrev(torch.sin))(x)
>>> assert jacobian.shape == (64, 5, 5)

jacrev can be composed with itself to produce hessians:

>>> def f(x):
>>>   return x.sin().sum()
>>> x = torch.randn(5)
>>> hessian = jacrev(jacrev(f))(x)


functorch._C.dump_tensor: Dumps dispatch keys on stack functorch._C._set_vmap_fallback_warning_enabled(False) if the vmap warning spam bothers you.

Future Plans

In the end state, we'd like to upstream this into PyTorch once we iron out the design details. To figure out the details, we need your help -- please send us your use cases by starting a conversation in the issue tracker or try out the prototype.


Functorch has a BSD-style license, as found in the LICENSE file.

  • ImportError: ~/.local/lib/python3.9/site-packages/functorch/ undefined symbol: _ZNK3c1010TensorImpl16sym_sizes_customEv

    ImportError: ~/.local/lib/python3.9/site-packages/functorch/ undefined symbol: _ZNK3c1010TensorImpl16sym_sizes_customEv

    Hi All,

    I was running an older version of PyTorch ( - built from source) with FuncTorch ( - built from source), and somehow I've broken the older version of functorch. When I import functorch I get the following error,

    import functorch
    #returns ImportError: ~/.local/lib/python3.9/site-packages/functorch/ undefined symbol: _ZNK3c1010TensorImpl16sym_sizes_customEv

    The version I had of functorch was 0.2.0a0+9d6ee76, is there a way to perhaps re-install to fix this ImportError? I do have the latest version of PyTorch/FuncTorch in a separate conda environment but I wanted to check how it compares to the older version in this 'older' conda environment PyTorch/Functorch were versions ,1.12.0a0+git7c2103a and 0.2.0a0+9d6ee76 respectively.

    Is there a way to download a specific version of functorch with ? Or another way to fix this issue?

    opened by AlphaBetaGamma96 24
  • Hessian (w.r.t inputs) calculation in PyTorch differs from FuncTorch

    Hessian (w.r.t inputs) calculation in PyTorch differs from FuncTorch

    Hi All,

    I've been trying to calculate the Hessian of the output of my network with respect to its inputs within FuncTorch. I had a version within PyTorch that supports batches, however, they seem to disagree with each other and I have no idea why they don't give the same results. Something is clearly wrong, I know my PyTorch version is right so either there's an issue in my version of FuncTorch or I've implemented it wrong in FuncTorch.

    Also, how can I use the has_aux flag in jacrev to return the jacobian from the first jacrev so I don't have to repeat the jacobian calculation?

    The only problem with my example is that it uses torch.linalg.slogdet and from what I remember FuncTorch can't vmap over .item(). I do have my own fork of pytorch where I edited the backward to remove the .item() call so it works with vmap. Although, it's not the greatest implementation as I just set it to the default nonsingular_case_backward like so,

    Tensor slogdet_backward(const Tensor& grad_logabsdet,
                            const Tensor& self,
                            const Tensor& signdet, const Tensor& logabsdet) {
      auto singular_case_backward = [&](const Tensor& grad_logabsdet, const Tensor& self) -> Tensor {
        Tensor u, sigma, vh;
        std::tie(u, sigma, vh) = at::linalg_svd(self, false);
        Tensor v = vh.mH();
        // sigma has all non-negative entries (also with at least one zero entry)
        // so logabsdet = \sum log(abs(sigma))
        // but det = 0, so backward logabsdet = \sum log(sigma)
        auto gsigma = grad_logabsdet.unsqueeze(-1).div(sigma);
        return svd_backward({}, gsigma, {}, u, sigma, vh);
      auto nonsingular_case_backward = [&](const Tensor& grad_logabsdet, const Tensor& self) -> Tensor {
        // TODO: replace self.inverse with linalg_inverse
        return unsqueeze_multiple(grad_logabsdet, {-1, -2}, self.dim()) * self.inverse().mH();
      auto nonsingular = nonsingular_case_backward(grad_logabsdet, self);
      return nonsingular;

    My 'minimal' reproducible script is below with the output shown below that. It computes the Laplacian via a PyTorch method and via FuncTorch for a single sample of size [A,1] where A is the number of input nodes to the network.

    import torch
    import torch.nn as nn
    from torch import Tensor
    import functorch
    from functorch import jacrev, jacfwd, hessian, make_functional, vmap
    import time 
    _ = torch.manual_seed(0)
    print("PyTorch version:   ", torch.__version__)
    print("CUDA version:      ", torch.version.cuda)
    print("FuncTorch version: ", functorch.__version__)
    def sync_time() -> float:
      return time.perf_counter()
    B=1 #batch
    A=3 #input nodes
    class model(nn.Module):
      def __init__(self, num_inputs, num_hidden):
        super(model, self).__init__()
        self.func = nn.Tanh()
        self.fc1 = nn.Linear(2, num_hidden)
        self.fc2 = nn.Linear(num_hidden, num_inputs)
      def forward(self, x):
        Takes x in [B,A,1] and maps it to sign/logabsdet value in Tuple([B,], [B,])
        rep=[1 for _ in range(idx)]
        rep[-2] = self.num_inputs
        g = x.mean(dim=(idx-2), keepdim=True).repeat(*rep)
        f =,g), dim=-1)
        h = self.func(self.fc1(f))
        mat = self.fc2(h)
        sgn, logabs = torch.linalg.slogdet(mat)
        return sgn, logabs
    net = model(A, 64)
    net =
    fnet, params = make_functional(net)
    def logabs(params, x):
      _, logabs = fnet(params, x)
      #print("functorch logabs: ",logabs)
      return logabs
    def kinetic_pytorch(xs: Tensor) -> Tensor:
      """Method to calculate the local kinetic energy values of a netork function, f, for samples, x.
      The values calculated here are 1/f d2f/dx2 which is equivalent to d2log(|f|)/dx2 + (dlog(|f|)/dx)^2
      within the log-domain (rather than the linear-domain).
      :param xs: The input positions of the many-body particles
      :type xs: class: `torch.Tensor`
      xis = [xi.requires_grad_() for xi in xs.flatten(start_dim=1).t()]
      xs_flat = torch.stack(xis, dim=1)
      _, ys = net(xs_flat.view_as(xs))
      #print("pytorch logabs: ",ys)
      ones = torch.ones_like(ys)
      #df_dx calculation
      (dy_dxs, ) = torch.autograd.grad(ys, xs_flat, ones, retain_graph=True, create_graph=True)
      #d2f_dx2 calculation (diagonal only)
      lay_ys = sum(torch.autograd.grad(dy_dxi, xi, ones, retain_graph=True, create_graph=False)[0] \
                    for xi, dy_dxi in zip(xis, (dy_dxs[..., i] for i in range(len(xis))))
      #print("(PyTorch): ",lay_ys, dy_dxs)
      ek_local_per_walker = -0.5 * (lay_ys + dy_dxs.pow(2).sum(-1)) #move const out of loop?
      return ek_local_per_walker
    jacjaclogabs = jacrev(jacrev(logabs, argnums=1), argnums=1)
    jaclogabs = jacrev(logabs, argnums=1)
    def kinetic_functorch(params, x):
      d2f_dx2 = vmap(jacjaclogabs, in_dims=(None, 0))(params, x)
      df_dx = vmap(jaclogabs, in_dims=(None, 0))(params, x)
      #print("(FuncTorch): ", d2f_dx2.squeeze(-3).squeeze(-1).diagonal(-2,-1).sum(-1), df_dx)
      #remove the trailing 1's so it's an A by A matrix 
      return -0.5 * d2f_dx2.squeeze(-3).squeeze(-1).diagonal(-2,-1).sum(-1) + df_dx.squeeze(-1).pow(2).sum(-1)
    x = torch.randn(B,A,1,device=device) #input Tensor 
    print("\nd2f/dx2, df/dx: ")
    kin_pt = kinetic_pytorch(x)
    kin_ft = kinetic_functorch(params, x)
    print("\nWalltime: ")
    print("PyTorch:   ",t2-t1)
    print("FuncTorch: ",t4-t3, "\n")
    print("Results: ")
    print("PyTorch: ",kin_pt)
    print("FuncTorch: ",kin_ft)

    This script returns

    PyTorch version:    1.12.0a0+git7c2103a
    CUDA version:       11.6
    FuncTorch version:  0.2.0a0+9d6ee76
    d2f/dx2, df/dx: 
    PyTorch:    0.4822753759999614
    FuncTorch:  0.004898710998531897 
    PyTorch:  tensor([1.3737], device='cuda:0', grad_fn=<MulBackward0>)    # should be the same values
    FuncTorch:  tensor([7.8411], device='cuda:0', grad_fn=<AddBackward0>) # the jacobian matches, but hessian does not

    Thanks for the help in advance! :)

    opened by AlphaBetaGamma96 18
  • add batching rule for block_diag, kill DECOMPOSE_FUNCTIONAL

    add batching rule for block_diag, kill DECOMPOSE_FUNCTIONAL

    Companion core PR:

    The above PR makes block_diag composite compliant, and this PR adds a batching rule for it.

    Those two changes together should let us fully remove the DECOMPOSE_FUNCTIONAL macro, which was preventing me from moving the Functionalize dispatch key below FuncTorchBatched (which I want to do as part of XX, in order to properly get functionalization working with LTC/XLA).

    cla signed 
    opened by bdhirsh 13
  • svd-related op regression in functorch

    svd-related op regression in functorch and caused svd-related tests in functorch to fail:


    The main problem seems to be that the backward pass uses in-place operations that are incompatible with vmap (aka Composite Compliance problems). There are some other failures that seem to be because some other operations are not Composite Compliant but somehow these weren't a problem previously.

    opened by zou3519 12
  • functorch doesn't work in debug mode

    functorch doesn't work in debug mode

    It's that autograd assert that we run into often:

    import torch
    from functorch import make_fx
    from functorch.compile import nnc_jit
    def f(x, y):
        return torch.broadcast_tensors(x, y)
    inp1 = torch.rand(())
    inp2 = torch.rand(3)
    print(f(inp1, inp2))  # without nnc compile everything works fine
    print(make_fx(f)(inp1, inp2))  # fails
    print(nnc_jit(f)(inp1, inp2))
    # RuntimeError: self__storage_saved.value().is_alias_of( ASSERT FAILED at "autograd/generated/VariableType_3.cpp":3899, please report a bug to PyTorch.

    cc @albanD @soulitzer what's the chance we can add an option to turn these off? They've been more harmful (e.g. prevent debugging in debug mode) than useful for us.

    opened by zou3519 11
  • Index put vmap internal assert

    Index put vmap internal assert

    import torch
    from functorch import vmap
    self = torch.randn(4, 1, 1).cuda()
    idx = (torch.tensor([0]).cuda(),)
    value = torch.randn(1, 1).cuda()
    def foo(x):
        return x.index_put_(idx, value, accumulate=True)
    RuntimeError: linearIndex.numel()*sliceSize*nElemBefore == value.numel()INTERNAL ASSERT FAILED at "/raid/rzou/pt/debug-cuda/aten/src/ATen/native/cuda/":249, please report a bug to PyTorch. number of flattened indices did not match number of elements in the value tensor41
    opened by zou3519 11
  • Batching rule not implemented for aten::item.

    Batching rule not implemented for aten::item.

    Hey, I would like to use functorch.vmap in a custom PyTorch activation function (the gradients are not needed, because the backward-pass is calculated differently). During the computation of the activation function, I do a lookup in a tensor X using a tensor Y.item() call, similar to the small dummy code below.

    Unfortunately I get the error message: RuntimeError: Batching rule not implemented for aten::item. We could not generate a fallback.

    Is it not possible to do an item() call in a vmap function or is something else wrong? Thanks a lot!

    import torch
    from functorch import vmap
    device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
    sum = torch.zeros([100, 10], dtype=torch.int32).to(device)
    lookup = torch.randint(100, (20, 1000, 10)).to(device)
    input_tensor = torch.randint(1000, (100, 20)).to(device)
    def test_fun(sum, input_tensor):
      for j in range(20):
        for i in range(10):
          sum[i] += lookup[j, input_tensor[j].item(), i]
      return sum
    # non-vectorized version
    for i in range(100):
      test_fun(sum[i], input_tensor[I])
    # vectorized version throws error
    test_fun_vec = vmap(test_fun)
    test_fun_vec(sum, input_tensor)
    opened by hallojs 10
  • torch.atleast_1d batching rule implementation

    torch.atleast_1d batching rule implementation

    Hi functorch devs! I'm filing this issue because my code prints the following warning:

    UserWarning: There is a performance drop because we have not yet implemented the batching rule for aten::atleast_1d. Please file us an issue on GitHub so that we can prioritize its implementation. (Triggered internally at  /tmp/pip-req-build-ytawxmfk/functorch/csrc/BatchedFallback.cpp:106.)

    Why Am I Using atleast_1d ?

    I'm subclassing torch.Tensor because my code needs to be able to add some extra data to that class (I'm integrating PyTorch's AD system with another AD system to be able to call torch functions from inside a PDE solve, which is why I also inherit from a class called OverloadedType), which is named _block_variable; e.g. the subclass looks like

    class MyTensor(torch.Tensor, OverloadedType):
        _block_variable = None
        def __new__(cls, x, *args, **kwargs):
            return super().__new__(cls, x, *args, **kwargs)
        def __init__(self, x, block_var=None):
            super(OverloadedType, self).__init__()
            self._block_variable = block_var or BlockVariable(self)
        def to(self, *args, **kwargs):
            new = Tensor([])
            tmp = super(torch.Tensor, self).to(*args, **kwargs)
            new.requires_grad = tmp.requires_grad
            new._block_variable = self._block_variable
            return new
         ... #some subclass-specific methods etc

    This causes problems when I have code that does stuff like torch.tensor([torch.trace(x), torch.trace(x @ x)]) where x is a square MyTensor; the torch.tensor() call raises an exception related to taking the __len__ of a 0-dimentional tensor (the scalar traces). So instead, I do[torch.atleast_1d(torch.trace(x)), torch.atleast_1d(torch.trace(x @ x))]), which works. However, this function is functorch.vmap-ed, which triggers the performance warning. It would be great if I could either get the naive implementation (using torch.tensor instead of to work, or if a batch rule for atleast_1d() were to be implemented.

    Thank you for any help you can provide!

    opened by DiffeoInvariant 10
  • Top 25 OpInfos for functorch

    Top 25 OpInfos for functorch

    We'd love help on these.

    The check box is for if the OpInfo has added to PyTorch core. The ultimate goal is for all of these OpInfos to exist in PyTorch core. The OpInfo is bolded if we have a poor man's version* of the OpInfo in the functorch repo (see


    • [x] torch.nn.functional.softmax (
    • [x] torch.nn.functional.relu (
    • [x] torch.nn.functional.interpolate (
    • [x] torch.nn.functional.pad (
    • [x] torch.nn.functional.normalize (
    • [x] torch.nn.functional.cross_entropy (
    • [x] torch.nn.functional.grid_sample (
    • [x] torch.nn.functional.one_hot (
    • [x] torch.nn.functional.mse_loss
    • [x] torch.nn.functional.conv2d (
    • [x] torch.nn.functional.dropout (
    • [x] torch.nn.functional.softplus (
    • [x] torch.nn.functional.linear (
    • [x] torch.nn.functional.avg_pool2d (
    • [x] torch.nn.functional.max_pool2d (
    • [x] torch.nn.functional.nll_loss (
    • [x] torch.nn.functional.embedding (
    • [x] torch.nn.functional.adaptive_avg_pool2d (
    • [x] torch.nn.functional.cosine_similarity (
    • [x] torch.nn.functional.unfold
    • [x] torch.nn.functional.batch_norm (
    • [x] torch.nn.functional.conv_transpose2d
    • [x] torch.nn.functional.layer_norm

    *Why do we have poor man's version of these OpInfos? It's because right now we only care about float32 sample inputs on CPU and CUDA and OpInfos have a lot of flags that take some time to tweak.

    opened by zou3519 10
  • Memory Leak

    Memory Leak

    Hello! I am thrilled with the functorch package, and have been playing with it lately.

    With @soumik12345 we found a memory leak after training a NN. We documented our findings here:

    We are probably doing something wrong, but the memory increases after each epoch.


    As the GPU is pretty monstrous we didn't notice this straight away, but it clearly fills up progresively. The stateful pytorch training loop does not produce this.

    high priority 
    opened by tcapelle 9
  • RuntimeError: CUDA error: no kernel image is available for execution on the device

    RuntimeError: CUDA error: no kernel image is available for execution on the device

    Hi, I have cuda 11.7 on my system and I am trying to install functorch, since the stable version of pytorch for cuda 11.7 is not available here, I just run pip install functorch which also installs the compatible version of pytorch.

    But when I run my code that uses the GPU, I get the following error :

    RuntimeError: CUDA error: no kernel image is available for execution on the device

    Is it possible to use functorch in my case?

    opened by ykemiche 8
  • Module not found after installation of nightly build

    Module not found after installation of nightly build


    I am using a Nvidia machine learning code called Modulus.

    It requires the use of pytorch and functorch.

    I'm using a docker container from Nvidia ( The pytorch version I have is 1.13.0a0+d321be6. I tried to install functorch nightly build and it was reported successful:

    [email protected]:/examples_2209/helmholtz# pip install "git+" Looking in indexes:, Collecting git+ Cloning to /tmp/pip-req-build-ihp2j8vw Running command git clone -q /tmp/pip-req-build-ihp2j8vw Resolved to commit 05284750f38d2a6ad8defe441d89562e7edf407b Requirement already satisfied: torch> in /opt/conda/lib/python3.8/site-packages (from functorch==0.3.0a0+528475) (1.13.0a0+d321be6) Requirement already satisfied: typing_extensions in /opt/conda/lib/python3.8/site-packages (from torch>>functorch==0.3.0a0+528475) (4.3.0) Building wheels for collected packages: functorch Building wheel for functorch ( ... done Created wheel for functorch: filename=functorch-0.3.0a0+528475-py2.py3-none-any.whl size=2240 sha256=cbaf2e64fa5fb47e196d9fd9676b7312cb65936caf988654523ad6d8efd681e4 Stored in directory: /tmp/pip-ephem-wheel-cache-obicds30/wheels/db/17/5b/938d2ee4d87a3156364c903c014c1e381a130429636147919b Successfully built functorch Installing collected packages: functorch Successfully installed functorch-0.3.0a0+528475

    However, when I tried to run my code it reported functorch not found:

    `[email protected]:/examples_2209/helmholtz# python Python 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:04:10) [GCC 10.3.0] on linux Type "help", "copyright", "credits" or "license" for more information.

    import torch from functorch import vmap Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'functorch' exit() `

    May I know why? Can you help?


    opened by zonexo 2
  • Add support for `tree_map` or document recommended alternative

    Add support for `tree_map` or document recommended alternative

    I'm working on testing some models using functorch along with torch-mlir and IREE. I don't see an analog of jax's tree_map. Is this something it makes sense for functorch to implement, or is there a recommended alternative?

    opened by dellis23 4
  • Speed up functorch tests in CI

    Speed up functorch tests in CI

    Here's roughly how the vmap testing works (pseudocode):

    all_permutations = create_all_batched_inputs()
    for batched_inputs in all_permutations:
      result = vmap(op)(batched_inputs)
      expected = for_loop_over_op(op, batched_inputs)
      assert torch.allclose(result, expected)

    There are two things that could be optimized:

    1. for_loop_over_op(op, batched_inputs). Instead of running a for-loop over the op with slices of batched_inputs, we can just run the op on the original input and expand the result.
    2. expected is the SAME across all iterations of the for loop in the example above. So we only need to compute it once.

    The end-state should look something like:

    all_permutations = create_all_batched_inputs()
    expected = expand(op(inputs))
    for batched_inputs in all_permutations:
      result = vmap(op)(batched_inputs)
      assert torch.allclose(result, expected)

    This will probably save us something like 50% of runtime on our vmap tests.

    opened by zou3519 0
  • functorch doesn't work with saved variable hooks

    functorch doesn't work with saved variable hooks

    I'm not sure why, cc @soulitzer @albanD.


    import torch
    from torch.autograd.graph import save_on_cpu
    from functorch import grad
    x = torch.randn([], device='cuda', requires_grad=True)
    def f(x):
        return x.sin().sin()
    with save_on_cpu():
        y = f(x)
        gx, = torch.autograd.grad(y, x, create_graph=True)
    assert gx.requires_grad
    with save_on_cpu():
        gx = grad(f)(x)
    # Fails
    assert gx.requires_grad
    opened by zou3519 1
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