4105 drops pt16 support

.github/workflows/cron.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: [self-hosted, linux, x64, common]
     strategy:
       matrix:
-        pytorch-version: [1.6.0, 1.7.1, 1.8.1, 1.9.1, latest]
+        pytorch-version: [1.7.1, 1.8.1, 1.9.1, 1.10.2, latest]
     steps:
     - uses: actions/checkout@v2
     - name: Install the dependencies
@@ -24,15 +24,15 @@ jobs:
         python -m pip install --upgrade pip wheel
         python -m pip uninstall -y torch torchvision
         if [ ${{ matrix.pytorch-version }} == "latest" ]; then
-          python -m pip install torch torchvision
-        elif [ ${{ matrix.pytorch-version }} == "1.6.0" ]; then
-          python -m pip install torch==1.6.0 torchvision==0.7.0
+          python -m pip install torch torchvision --extra-index-url https://download.pytorch.org/whl/cu113
         elif [ ${{ matrix.pytorch-version }} == "1.7.1" ]; then
-          python -m pip install torch==1.7.1 torchvision==0.8.2
+          python -m pip install torch==1.7.1 torchvision==0.8.2 --extra-index-url https://download.pytorch.org/whl/cu113
         elif [ ${{ matrix.pytorch-version }} == "1.8.1" ]; then
-          python -m pip install torch==1.8.1 torchvision==0.9.1
+          python -m pip install torch==1.8.1 torchvision==0.9.1 --extra-index-url https://download.pytorch.org/whl/cu113
         elif [ ${{ matrix.pytorch-version }} == "1.9.1" ]; then
-          python -m pip install torch==1.9.1 torchvision==0.10.1
+          python -m pip install torch==1.9.1 torchvision==0.10.1 --extra-index-url https://download.pytorch.org/whl/cu113
+        elif [ ${{ matrix.pytorch-version }} == "1.10.2" ]; then
+          python -m pip install torch==1.10.2 torchvision==0.11.3 --extra-index-url https://download.pytorch.org/whl/cu113
         fi
         python -m pip install -r requirements-dev.txt
         python -m pip list

.github/workflows/pythonapp-gpu.yml

@@ -50,7 +50,7 @@ jobs:
             pytorch: "-h"
             base: "nvcr.io/nvidia/pytorch:22.03-py3"
           - environment: PT110+CUDA102
-            pytorch: "torch==1.10.1 torchvision==0.11.2"
+            pytorch: "torch==1.10.2 torchvision==0.11.3"
             base: "nvcr.io/nvidia/cuda:10.2-devel-ubuntu18.04"
           - environment: PT111+CUDA102
             pytorch: "torch==1.11.0 torchvision==0.12.0"

.github/workflows/pythonapp-min.yml

@@ -119,7 +119,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        pytorch-version: [1.6.0, 1.7.1, 1.8.1, 1.9.1, 1.10.1, latest]
+        pytorch-version: [1.7.1, 1.8.1, 1.9.1, 1.10.2, latest]
     timeout-minutes: 40
     steps:
     - uses: actions/checkout@v2
@@ -148,16 +148,14 @@ jobs:
         # min. requirements
         if [ ${{ matrix.pytorch-version }} == "latest" ]; then
           python -m pip install torch
-        elif [ ${{ matrix.pytorch-version }} == "1.6.0" ]; then
-          python -m pip install torch==1.6.0
         elif [ ${{ matrix.pytorch-version }} == "1.7.1" ]; then
           python -m pip install torch==1.7.1
         elif [ ${{ matrix.pytorch-version }} == "1.8.1" ]; then
           python -m pip install torch==1.8.1
         elif [ ${{ matrix.pytorch-version }} == "1.9.1" ]; then
           python -m pip install torch==1.9.1
-        elif [ ${{ matrix.pytorch-version }} == "1.10.1" ]; then
-          python -m pip install torch==1.10.1
+        elif [ ${{ matrix.pytorch-version }} == "1.10.2" ]; then
+          python -m pip install torch==1.10.2
         fi
         python -m pip install -r requirements-min.txt
         python -m pip list

.github/workflows/pythonapp.yml

@@ -137,7 +137,7 @@ jobs:
         # install the latest pytorch for testing
         # however, "pip install monai*.tar.gz" will build cpp/cuda with an isolated
         # fresh torch installation according to pyproject.toml
-        python -m pip install torch>=1.6 torchvision
+        python -m pip install torch>=1.7 torchvision
     - name: Check packages
       run: |
         pip uninstall monai

monai/data/torchscript_utils.py

@@ -18,7 +18,6 @@
 
 from monai.config import get_config_values
 from monai.utils import JITMetadataKeys
-from monai.utils.module import pytorch_after
 
 METADATA_FILENAME = "metadata.json"
 
@@ -80,19 +79,10 @@ def save_net_with_metadata(
 
     json_data = json.dumps(metadict)
 
-    # Pytorch>1.6 can use dictionaries directly, otherwise need to use special map object
-    if pytorch_after(1, 7):
-        extra_files = {METADATA_FILENAME: json_data.encode()}
+    extra_files = {METADATA_FILENAME: json_data.encode()}
 
-        if more_extra_files is not None:
-            extra_files.update(more_extra_files)
-    else:
-        extra_files = torch._C.ExtraFilesMap()  # type:ignore[attr-defined]
-        extra_files[METADATA_FILENAME] = json_data.encode()
-
-        if more_extra_files is not None:
-            for k, v in more_extra_files.items():
-                extra_files[k] = v
+    if more_extra_files is not None:
+        extra_files.update(more_extra_files)
 
     if isinstance(filename_prefix_or_stream, str):
         filename_no_ext, ext = os.path.splitext(filename_prefix_or_stream)
@@ -123,16 +113,8 @@ def load_net_with_metadata(
     Returns:
         Triple containing loaded object, metadata dict, and extra files dict containing other file data if present
     """
-    # Pytorch>1.6 can use dictionaries directly, otherwise need to use special map object
-    if pytorch_after(1, 7):
-        extra_files = {f: "" for f in more_extra_files}
-        extra_files[METADATA_FILENAME] = ""
-    else:
-        extra_files = torch._C.ExtraFilesMap()  # type:ignore[attr-defined]
-        extra_files[METADATA_FILENAME] = ""
-
-        for f in more_extra_files:
-            extra_files[f] = ""
+    extra_files = {f: "" for f in more_extra_files}
+    extra_files[METADATA_FILENAME] = ""
 
     jit_obj = torch.jit.load(filename_prefix_or_stream, map_location, extra_files)
 

monai/engines/trainer.py

@@ -26,7 +26,7 @@
 from monai.engines.workflow import Workflow
 from monai.inferers import Inferer, SimpleInferer
 from monai.transforms import Transform
-from monai.utils import min_version, optional_import, pytorch_after
+from monai.utils import min_version, optional_import
 from monai.utils.enums import CommonKeys as Keys
 
 if TYPE_CHECKING:
@@ -193,11 +193,7 @@ def _compute_pred_loss():
             engine.fire_event(IterationEvents.LOSS_COMPLETED)
 
         self.network.train()
-        # `set_to_none` only work from PyTorch 1.7.0
-        if not pytorch_after(1, 7):
-            self.optimizer.zero_grad()
-        else:
-            self.optimizer.zero_grad(set_to_none=self.optim_set_to_none)
+        self.optimizer.zero_grad(set_to_none=self.optim_set_to_none)
 
         if self.amp and self.scaler is not None:
             with torch.cuda.amp.autocast():
@@ -366,11 +362,7 @@ def _iteration(
         # Train Discriminator
         d_total_loss = torch.zeros(1)
         for _ in range(self.d_train_steps):
-            # `set_to_none` only work from PyTorch 1.7.0
-            if not pytorch_after(1, 7):
-                self.d_optimizer.zero_grad()
-            else:
-                self.d_optimizer.zero_grad(set_to_none=self.optim_set_to_none)
+            self.d_optimizer.zero_grad(set_to_none=self.optim_set_to_none)
             dloss = self.d_loss_function(g_output, d_input)
             dloss.backward()
             self.d_optimizer.step()
@@ -385,10 +377,7 @@ def _iteration(
                 non_blocking=engine.non_blocking,  # type: ignore
             )
         g_output = self.g_inferer(g_input, self.g_network)
-        if not pytorch_after(1, 7):
-            self.g_optimizer.zero_grad()
-        else:
-            self.g_optimizer.zero_grad(set_to_none=self.optim_set_to_none)
+        self.g_optimizer.zero_grad(set_to_none=self.optim_set_to_none)
         g_loss = self.g_loss_function(g_output)
         g_loss.backward()
         self.g_optimizer.step()

monai/networks/layers/simplelayers.py

@@ -20,19 +20,11 @@
 
 from monai.networks.layers.convutils import gaussian_1d
 from monai.networks.layers.factories import Conv
-from monai.utils import (
-    ChannelMatching,
-    InvalidPyTorchVersionError,
-    SkipMode,
-    look_up_option,
-    optional_import,
-    pytorch_after,
-)
+from monai.utils import ChannelMatching, SkipMode, look_up_option, optional_import, pytorch_after
 from monai.utils.misc import issequenceiterable
 
 _C, _ = optional_import("monai._C")
-if pytorch_after(1, 7):
-    fft, _ = optional_import("torch.fft")
+fft, _ = optional_import("torch.fft")
 
 __all__ = [
     "ChannelPad",
@@ -377,7 +369,6 @@ def _make_coeffs(window_length, order):
 class HilbertTransform(nn.Module):
     """
     Determine the analytical signal of a Tensor along a particular axis.
-    Requires PyTorch 1.7.0+ and the PyTorch FFT module (which is not included in NVIDIA PyTorch Release 20.10).
 
     Args:
         axis: Axis along which to apply Hilbert transform. Default 2 (first spatial dimension).
@@ -386,9 +377,6 @@ class HilbertTransform(nn.Module):
 
     def __init__(self, axis: int = 2, n: Union[int, None] = None) -> None:
 
-        if not pytorch_after(1, 7):
-            raise InvalidPyTorchVersionError("1.7.0", self.__class__.__name__)
-
         super().__init__()
         self.axis = axis
         self.n = n

monai/networks/utils.py

@@ -502,7 +502,6 @@ def convert_to_torchscript(
         filename_or_obj: if not None, specify a file-like object (has to implement write and flush)
             or a string containing a file path name to save the TorchScript model.
         extra_files: map from filename to contents which will be stored as part of the save model file.
-            works for PyTorch 1.7 or later.
             for more details: https://pytorch.org/docs/stable/generated/torch.jit.save.html.
         verify: whether to verify the input and output of TorchScript model.
             if `filename_or_obj` is not None, load the saved TorchScript model and verify.
@@ -519,10 +518,7 @@ def convert_to_torchscript(
     with torch.no_grad():
         script_module = torch.jit.script(model, **kwargs)
         if filename_or_obj is not None:
-            if not pytorch_after(1, 7):
-                torch.jit.save(m=script_module, f=filename_or_obj)
-            else:
-                torch.jit.save(m=script_module, f=filename_or_obj, _extra_files=extra_files)
+            torch.jit.save(m=script_module, f=filename_or_obj, _extra_files=extra_files)
 
     if verify:
         if device is None:

monai/transforms/intensity/array.py

@@ -30,14 +30,12 @@
 from monai.transforms.utils import Fourier, equalize_hist, is_positive, rescale_array
 from monai.transforms.utils_pytorch_numpy_unification import clip, percentile, where
 from monai.utils import (
-    InvalidPyTorchVersionError,
     convert_data_type,
     convert_to_dst_type,
     ensure_tuple,
     ensure_tuple_rep,
     ensure_tuple_size,
     fall_back_tuple,
-    pytorch_after,
 )
 from monai.utils.deprecate_utils import deprecated_arg
 from monai.utils.enums import TransformBackends
@@ -1085,7 +1083,6 @@ def __call__(self, img: NdarrayOrTensor) -> NdarrayOrTensor:
 class DetectEnvelope(Transform):
     """
     Find the envelope of the input data along the requested axis using a Hilbert transform.
-    Requires PyTorch 1.7.0+ and the PyTorch FFT module (which is not included in NVIDIA PyTorch Release 20.10).
 
     Args:
         axis: Axis along which to detect the envelope. Default 1, i.e. the first spatial dimension.
@@ -1098,9 +1095,6 @@ class DetectEnvelope(Transform):
 
     def __init__(self, axis: int = 1, n: Union[int, None] = None) -> None:
 
-        if not pytorch_after(1, 7):
-            raise InvalidPyTorchVersionError("1.7.0", self.__class__.__name__)
-
         if axis < 0:
             raise ValueError("axis must be zero or positive.")
 

monai/transforms/utils_pytorch_numpy_unification.py

@@ -15,7 +15,7 @@
 import torch
 
 from monai.config.type_definitions import NdarrayOrTensor, NdarrayTensor
-from monai.utils.misc import ensure_tuple, is_module_ver_at_least
+from monai.utils.misc import is_module_ver_at_least
 from monai.utils.type_conversion import convert_data_type, convert_to_dst_type
 
 __all__ = [
@@ -54,31 +54,12 @@ def allclose(a: NdarrayTensor, b: NdarrayOrTensor, rtol=1e-5, atol=1e-8, equal_n
 
 
 def moveaxis(x: NdarrayOrTensor, src: Union[int, Sequence[int]], dst: Union[int, Sequence[int]]) -> NdarrayOrTensor:
-    """`moveaxis` for pytorch and numpy, using `permute` for pytorch version < 1.7"""
+    """`moveaxis` for pytorch and numpy"""
     if isinstance(x, torch.Tensor):
-        if hasattr(torch, "movedim"):  # `movedim` is new in torch 1.7.0
-            # torch.moveaxis is a recent alias since torch 1.8.0
-            return torch.movedim(x, src, dst)  # type: ignore
-        return _moveaxis_with_permute(x, src, dst)
+        return torch.movedim(x, src, dst)  # type: ignore
     return np.moveaxis(x, src, dst)
 
 
-def _moveaxis_with_permute(
-    x: torch.Tensor, src: Union[int, Sequence[int]], dst: Union[int, Sequence[int]]
-) -> torch.Tensor:
-    # get original indices
-    indices = list(range(x.ndim))
-    len_indices = len(indices)
-    for s, d in zip(ensure_tuple(src), ensure_tuple(dst)):
-        # make src and dst positive
-        # remove desired index and insert it in new position
-        pos_s = len_indices + s if s < 0 else s
-        pos_d = len_indices + d if d < 0 else d
-        indices.pop(pos_s)
-        indices.insert(pos_d, pos_s)
-    return x.permute(indices)
-
-
 def in1d(x, y):
     """`np.in1d` with equivalent implementation for torch."""
     if isinstance(x, np.ndarray):
@@ -101,18 +82,15 @@ def percentile(
 ) -> Union[NdarrayOrTensor, float, int]:
     """`np.percentile` with equivalent implementation for torch.
 
-    Pytorch uses `quantile`, but this functionality is only available from v1.7.
-    For earlier methods, we calculate it ourselves. This doesn't do interpolation,
-    so is the equivalent of ``numpy.percentile(..., interpolation="nearest")``.
-    For more details, please refer to:
+    Pytorch uses `quantile`. For more details please refer to:
     https://pytorch.org/docs/stable/generated/torch.quantile.html.
     https://numpy.org/doc/stable/reference/generated/numpy.percentile.html.
 
     Args:
         x: input data
         q: percentile to compute (should in range 0 <= q <= 100)
         dim: the dim along which the percentiles are computed. default is to compute the percentile
-            along a flattened version of the array. only work for numpy array or Tensor with PyTorch >= 1.7.0.
+            along a flattened version of the array.
         keepdim: whether the output data has dim retained or not.
         kwargs: if `x` is numpy array, additional args for `np.percentile`, more details:
             https://numpy.org/doc/stable/reference/generated/numpy.percentile.html.
@@ -130,18 +108,7 @@ def percentile(
         result = np.percentile(x, q, axis=dim, keepdims=keepdim, **kwargs)
     else:
         q = torch.tensor(q, device=x.device)
-        if hasattr(torch, "quantile"):  # `quantile` is new in torch 1.7.0
-            result = torch.quantile(x, q / 100.0, dim=dim, keepdim=keepdim)
-        else:
-            # Note that ``kthvalue()`` works one-based, i.e., the first sorted value
-            # corresponds to k=1, not k=0. Thus, we need the `1 +`.
-            k = 1 + (0.01 * q * (x.numel() - 1)).round().int()
-            if k.numel() > 1:
-                r = [x.view(-1).kthvalue(int(_k)).values.item() for _k in k]
-                result = torch.tensor(r, device=x.device)
-            else:
-                result = x.view(-1).kthvalue(int(k)).values.item()
-
+        result = torch.quantile(x, q / 100.0, dim=dim, keepdim=keepdim)
     return result
 
 
@@ -277,8 +244,6 @@ def any_np_pt(x: NdarrayOrTensor, axis: Union[int, Sequence[int]]) -> NdarrayOrT
 def maximum(a: NdarrayOrTensor, b: NdarrayOrTensor) -> NdarrayOrTensor:
     """`np.maximum` with equivalent implementation for torch.
 
-    `torch.maximum` only available from pt>1.6, else use `torch.stack` and `torch.max`.
-
     Args:
         a: first array/tensor
         b: second array/tensor
@@ -287,10 +252,7 @@ def maximum(a: NdarrayOrTensor, b: NdarrayOrTensor) -> NdarrayOrTensor:
         Element-wise maximum between two arrays/tensors.
     """
     if isinstance(a, torch.Tensor) and isinstance(b, torch.Tensor):
-        # is torch and has torch.maximum (pt>1.6)
-        if hasattr(torch, "maximum"):  # `maximum` is new in torch 1.7.0
-            return torch.maximum(a, b)
-        return torch.stack((a, b)).max(dim=0)[0]
+        return torch.maximum(a, b)
     return np.maximum(a, b)
 
 

pyproject.toml

@@ -2,7 +2,7 @@
 requires = [
   "wheel",
   "setuptools",
-  "torch>=1.6",
+  "torch>=1.7",
   "ninja",
 ]
 

requirements.txt

@@ -1,2 +1,2 @@
-torch>=1.6
+torch>=1.7
 numpy>=1.17

setup.cfg

@@ -24,7 +24,7 @@ setup_requires =
     torch
     ninja
 install_requires =
-    torch>=1.6
+    torch>=1.7
     numpy>=1.17
 
 [options.extras_require]