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zero-cost-nas/foresight/pruners/measures/__init__.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+
+available_measures = []
+_measure_impls = {}
+
+
+def measure(name, bn=True, copy_net=True, force_clean=True, **impl_args):
+    def make_impl(func):
+        def measure_impl(net_orig, device, *args, **kwargs):
+            if copy_net:
+                net = net_orig.get_prunable_copy(bn=bn).to(device)
+            else:
+                net = net_orig
+            ret = func(net, *args, **kwargs, **impl_args)
+            if copy_net and force_clean:
+                import gc
+                import torch
+                del net
+                torch.cuda.empty_cache()
+                gc.collect()
+            return ret
+
+        global _measure_impls
+        if name in _measure_impls:
+            raise KeyError(f'Duplicated measure! {name}')
+        available_measures.append(name)
+        _measure_impls[name] = measure_impl
+        return func
+    return make_impl
+
+
+def calc_measure(name, net, device, *args, **kwargs):
+    return _measure_impls[name](net, device, *args, **kwargs)
+
+
+def load_all():
+    from . import grad_norm
+    from . import snip
+    from . import grasp
+    from . import fisher
+    from . import jacob_cov
+    from . import plain
+    from . import synflow
+    from . import var
+    from . import cor
+    from . import norm
+    from . import meco
+    from . import zico
+
+
+# TODO: should we do that by default?
+load_all()

zero-cost-nas/foresight/pruners/measures/cor.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+import time
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+
+from . import measure
+
+
+def get_score(net, x, target, device, split_data):
+    result_list = []
+    def forward_hook(module, data_input, data_output):
+        corr = np.mean(np.corrcoef(data_input[0].detach().cpu().numpy()))
+        result_list.append(corr)
+    net.classifier.register_forward_hook(forward_hook)
+
+    N = x.shape[0]
+    for sp in range(split_data):
+        st = sp * N // split_data
+        en = (sp + 1) * N // split_data
+        y = net(x[st:en])
+    cor = result_list[0].item()
+    result_list.clear()
+    return cor
+
+
+
+@measure('cor', bn=True)
+def compute_norm(net, inputs, targets, split_data=1, loss_fn=None):
+    device = inputs.device
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    try:
+        cor= get_score(net, inputs, targets, device, split_data=split_data)
+    except Exception as e:
+        print(e)
+        cor= np.nan
+
+    return cor

zero-cost-nas/foresight/pruners/measures/fisher.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+import types
+
+from . import measure
+from ..p_utils import get_layer_metric_array, reshape_elements
+
+
+def fisher_forward_conv2d(self, x):
+    x = F.conv2d(x, self.weight, self.bias, self.stride,
+                    self.padding, self.dilation, self.groups)
+    #intercept and store the activations after passing through 'hooked' identity op
+    self.act = self.dummy(x)
+    return self.act
+
+def fisher_forward_linear(self, x):
+    x = F.linear(x, self.weight, self.bias)
+    self.act = self.dummy(x)
+    return self.act
+
+@measure('fisher', bn=True, mode='channel')
+def compute_fisher_per_weight(net, inputs, targets, loss_fn, mode, split_data=1):
+    
+    device = inputs.device
+
+    if mode == 'param':
+        raise ValueError('Fisher pruning does not support parameter pruning.')
+
+    net.train()
+    all_hooks = []
+    for layer in net.modules():
+        if isinstance(layer, nn.Conv2d) or isinstance(layer, nn.Linear):
+            #variables/op needed for fisher computation
+            layer.fisher = None
+            layer.act = 0.
+            layer.dummy = nn.Identity()
+
+            #replace forward method of conv/linear
+            if isinstance(layer, nn.Conv2d):
+                layer.forward = types.MethodType(fisher_forward_conv2d, layer)
+            if isinstance(layer, nn.Linear):
+                layer.forward = types.MethodType(fisher_forward_linear, layer)
+
+            #function to call during backward pass (hooked on identity op at output of layer)
+            def hook_factory(layer):
+                def hook(module, grad_input, grad_output):
+                    act = layer.act.detach()
+                    grad = grad_output[0].detach()
+                    if len(act.shape) > 2:
+                        g_nk = torch.sum((act * grad), list(range(2,len(act.shape))))
+                    else:
+                        g_nk = act * grad
+                    del_k = g_nk.pow(2).mean(0).mul(0.5)
+                    if layer.fisher is None:
+                        layer.fisher = del_k
+                    else:
+                        layer.fisher += del_k
+                    del layer.act #without deleting this, a nasty memory leak occurs! related: https://discuss.pytorch.org/t/memory-leak-when-using-forward-hook-and-backward-hook-simultaneously/27555
+                return hook
+
+            #register backward hook on identity fcn to compute fisher info
+            layer.dummy.register_backward_hook(hook_factory(layer))
+
+    N = inputs.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+
+        net.zero_grad()
+        outputs = net(inputs[st:en])
+        loss = loss_fn(outputs, targets[st:en])
+        loss.backward()
+
+    # retrieve fisher info
+    def fisher(layer):
+        if layer.fisher is not None:
+            return torch.abs(layer.fisher.detach())
+        else:
+            return torch.zeros(layer.weight.shape[0]) #size=ch
+
+    grads_abs_ch = get_layer_metric_array(net, fisher, mode)
+
+    #broadcast channel value here to all parameters in that channel
+    #to be compatible with stuff downstream (which expects per-parameter metrics)
+    #TODO cleanup on the selectors/apply_prune_mask side (?)
+    shapes = get_layer_metric_array(net, lambda l : l.weight.shape[1:], mode)
+
+    grads_abs = reshape_elements(grads_abs_ch, shapes, device)
+
+    return grads_abs

zero-cost-nas/foresight/pruners/measures/grad_norm.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+import torch.nn.functional as F
+
+import copy
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+@measure('grad_norm', bn=True)
+def get_grad_norm_arr(net, inputs, targets, loss_fn, split_data=1, skip_grad=False):
+    net.zero_grad()
+    N = inputs.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+
+        outputs = net.forward(inputs[st:en])
+        loss = loss_fn(outputs, targets[st:en])
+        loss.backward()
+
+        grad_norm_arr = get_layer_metric_array(net, lambda l: l.weight.grad.norm() if l.weight.grad is not None else torch.zeros_like(l.weight), mode='param')
+        
+    return grad_norm_arr

zero-cost-nas/foresight/pruners/measures/grasp.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import torch.autograd as autograd
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+@measure('grasp', bn=True, mode='param')
+def compute_grasp_per_weight(net, inputs, targets, mode, loss_fn, T=1, num_iters=1, split_data=1):
+
+    # get all applicable weights
+    weights = []
+    for layer in net.modules():
+        if isinstance(layer, nn.Conv2d) or isinstance(layer, nn.Linear):
+            weights.append(layer.weight)
+            layer.weight.requires_grad_(True) # TODO isn't this already true?
+
+    # NOTE original code had some input/target splitting into 2
+    # I am guessing this was because of GPU mem limit
+    net.zero_grad()
+    N = inputs.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+
+        #forward/grad pass #1
+        grad_w = None
+        for _ in range(num_iters):
+            #TODO get new data, otherwise num_iters is useless!
+            outputs = net.forward(inputs[st:en])/T
+            loss = loss_fn(outputs, targets[st:en])
+            grad_w_p = autograd.grad(loss, weights, allow_unused=True)
+            if grad_w is None:
+                grad_w = list(grad_w_p)
+            else:
+                for idx in range(len(grad_w)):
+                    grad_w[idx] += grad_w_p[idx]
+
+    
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+
+        # forward/grad pass #2
+        outputs = net.forward(inputs[st:en])/T
+        loss = loss_fn(outputs, targets[st:en])
+        grad_f = autograd.grad(loss, weights, create_graph=True, allow_unused=True)
+        
+        # accumulate gradients computed in previous step and call backwards
+        z, count = 0,0
+        for layer in net.modules():
+            if isinstance(layer, nn.Conv2d) or isinstance(layer, nn.Linear):
+                if grad_w[count] is not None:
+                    z += (grad_w[count].data * grad_f[count]).sum()
+                count += 1
+        z.backward()
+
+    # compute final sensitivity metric and put in grads
+    def grasp(layer):
+        if layer.weight.grad is not None:
+            return -layer.weight.data * layer.weight.grad   # -theta_q Hg
+            #NOTE in the grasp code they take the *bottom* (1-p)% of values
+            #but we take the *top* (1-p)%, therefore we remove the -ve sign
+            #EDIT accuracy seems to be negatively correlated with this metric, so we add -ve sign here!
+        else:
+            return torch.zeros_like(layer.weight)
+    
+    grads = get_layer_metric_array(net, grasp, mode)
+
+    return grads

zero-cost-nas/foresight/pruners/measures/jacob_cov.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+import numpy as np
+
+from . import measure
+
+
+def get_batch_jacobian(net, x, target, device, split_data):
+    x.requires_grad_(True)
+
+    N = x.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+        y = net(x[st:en])
+        y.backward(torch.ones_like(y))
+
+    jacob = x.grad.detach()
+    x.requires_grad_(False)
+    return jacob, target.detach()
+
+def eval_score(jacob, labels=None):
+    corrs = np.corrcoef(jacob)
+    v, _  = np.linalg.eig(corrs)
+    k = 1e-5
+    return -np.sum(np.log(v + k) + 1./(v + k))
+
+@measure('jacob_cov', bn=True)
+def compute_jacob_cov(net, inputs, targets, split_data=1, loss_fn=None):
+    device = inputs.device
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    jacobs, labels = get_batch_jacobian(net, inputs, targets, device, split_data=split_data)
+    jacobs = jacobs.reshape(jacobs.size(0), -1).cpu().numpy()
+
+    try:
+        jc = eval_score(jacobs, labels)
+    except Exception as e:
+        print(e)
+        jc = np.nan
+
+    return jc

zero-cost-nas/foresight/pruners/measures/l2_norm.py

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+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+@measure('l2_norm', copy_net=False, mode='param')
+def get_l2_norm_array(net, inputs, targets, mode, split_data=1):
+    return get_layer_metric_array(net, lambda l: l.weight.norm(), mode=mode)

zero-cost-nas/foresight/pruners/measures/meco.py

@@ -0,0 +1,69 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+import copy
+import time
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+from torch import nn
+
+from . import measure
+
+
+def get_score(net, x, target, device, split_data):
+    result_list = []
+
+    def forward_hook(module, data_input, data_output):
+
+        fea = data_output[0].detach()
+        fea = fea.reshape(fea.shape[0], -1)
+        corr = torch.corrcoef(fea)
+        corr[torch.isnan(corr)] = 0
+        corr[torch.isinf(corr)] = 0
+        values = torch.linalg.eig(corr)[0]
+        # result = np.real(np.min(values)) / np.real(np.max(values))
+        result = torch.min(torch.real(values))
+        result_list.append(result)
+
+    for name, modules in net.named_modules():
+        modules.register_forward_hook(forward_hook)
+
+
+
+    N = x.shape[0]
+    for sp in range(split_data):
+        st = sp * N // split_data
+        en = (sp + 1) * N // split_data
+        y = net(x[st:en])
+    results = torch.tensor(result_list)
+    results = results[torch.logical_not(torch.isnan(results))]
+    v = torch.sum(results)
+    result_list.clear()
+    return v.item()
+
+
+
+@measure('meco', bn=True)
+def compute_meco(net, inputs, targets, split_data=1, loss_fn=None):
+    device = inputs.device
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    try:
+        meco = get_score(net, inputs, targets, device, split_data=split_data)
+    except Exception as e:
+        print(e)
+        meco = np.nan, None
+    return meco

zero-cost-nas/foresight/pruners/measures/norm.py

@@ -0,0 +1,55 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+import time
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+
+from . import measure
+
+
+def get_score(net, x, target, device, split_data):
+    result_list = []
+    def forward_hook(module, data_input, data_output):
+        norm = torch.norm(data_input[0])
+        result_list.append(norm)
+    net.classifier.register_forward_hook(forward_hook)
+
+    N = x.shape[0]
+    for sp in range(split_data):
+        st = sp * N // split_data
+        en = (sp + 1) * N // split_data
+        y = net(x[st:en])
+    n = result_list[0].item()
+    result_list.clear()
+    return n
+
+
+
+@measure('norm', bn=True)
+def compute_norm(net, inputs, targets, split_data=1, loss_fn=None):
+    device = inputs.device
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    # print('var:', feature.shape)
+    try:
+        norm, t = get_score(net, inputs, targets, device, split_data=split_data)
+    except Exception as e:
+        print(e)
+        norm, t = np.nan, None
+    # print(jc)
+    # print(f'norm time: {t} s')
+    return norm, t

zero-cost-nas/foresight/pruners/measures/param_count.py

@@ -0,0 +1,16 @@
+import time
+import torch
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+
+@measure('param_count', copy_net=False, mode='param')
+def get_param_count_array(net, inputs, targets, mode, loss_fn, split_data=1):
+    s = time.time()
+    count = get_layer_metric_array(net, lambda l: torch.tensor(sum(p.numel() for p in l.parameters() if p.requires_grad)), mode=mode)
+    e = time.time()
+    t = e - s
+    # print(f'param_count time: {t} s')
+    return count, t

zero-cost-nas/foresight/pruners/measures/plain.py

@@ -0,0 +1,44 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+import torch.nn.functional as F
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+@measure('plain', bn=True, mode='param')
+def compute_plain_per_weight(net, inputs, targets, mode, loss_fn, split_data=1):
+
+    net.zero_grad()
+    N = inputs.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+
+        outputs = net.forward(inputs[st:en])
+        loss = loss_fn(outputs, targets[st:en])
+        loss.backward()
+
+    # select the gradients that we want to use for search/prune
+    def plain(layer):
+        if layer.weight.grad is not None:
+            return layer.weight.grad * layer.weight
+        else:
+            return torch.zeros_like(layer.weight)
+
+    grads_abs = get_layer_metric_array(net, plain, mode)
+    return grads_abs

zero-cost-nas/foresight/pruners/measures/snip.py

@@ -0,0 +1,69 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+import copy
+import types
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+def snip_forward_conv2d(self, x):
+        return F.conv2d(x, self.weight * self.weight_mask, self.bias,
+                        self.stride, self.padding, self.dilation, self.groups)
+
+def snip_forward_linear(self, x):
+        return F.linear(x, self.weight * self.weight_mask, self.bias)
+
+@measure('snip', bn=True, mode='param')
+def compute_snip_per_weight(net, inputs, targets, mode, loss_fn, split_data=1):
+    for layer in net.modules():
+        if isinstance(layer, nn.Conv2d) or isinstance(layer, nn.Linear):
+            layer.weight_mask = nn.Parameter(torch.ones_like(layer.weight))
+            layer.weight.requires_grad = False
+
+        # Override the forward methods:
+        if isinstance(layer, nn.Conv2d):
+            layer.forward = types.MethodType(snip_forward_conv2d, layer)
+
+        if isinstance(layer, nn.Linear):
+            layer.forward = types.MethodType(snip_forward_linear, layer)
+
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+    N = inputs.shape[0]
+    for sp in range(split_data):
+        st=sp*N//split_data
+        en=(sp+1)*N//split_data
+    
+        outputs = net.forward(inputs[st:en])
+        loss = loss_fn(outputs, targets[st:en])
+        loss.backward()
+
+    # select the gradients that we want to use for search/prune
+    def snip(layer):
+        if layer.weight_mask.grad is not None:
+            return torch.abs(layer.weight_mask.grad)
+        else:
+            return torch.zeros_like(layer.weight)
+    
+    grads_abs = get_layer_metric_array(net, snip, mode)
+
+    return grads_abs

zero-cost-nas/foresight/pruners/measures/synflow.py

@@ -0,0 +1,69 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import torch
+
+from . import measure
+from ..p_utils import get_layer_metric_array
+
+
+@measure('synflow', bn=False, mode='param')
+@measure('synflow_bn', bn=True, mode='param')
+def compute_synflow_per_weight(net, inputs, targets, mode, split_data=1, loss_fn=None):
+
+    device = inputs.device
+
+    #convert params to their abs. Keep sign for converting it back.
+    @torch.no_grad()
+    def linearize(net):
+        signs = {}
+        for name, param in net.state_dict().items():
+            signs[name] = torch.sign(param)
+            param.abs_()
+        return signs
+
+    #convert to orig values
+    @torch.no_grad()
+    def nonlinearize(net, signs):
+        for name, param in net.state_dict().items():
+            if 'weight_mask' not in name:
+                param.mul_(signs[name])
+
+    # keep signs of all params
+    signs = linearize(net)
+    
+    # Compute gradients with input of 1s 
+    net.zero_grad()
+    net.double()
+    input_dim = list(inputs[0,:].shape)
+    inputs = torch.ones([1] + input_dim).double().to(device)
+    output = net.forward(inputs)
+    torch.sum(output).backward() 
+
+    # select the gradients that we want to use for search/prune
+    def synflow(layer):
+        if layer.weight.grad is not None:
+            return torch.abs(layer.weight * layer.weight.grad)
+        else:
+            return torch.zeros_like(layer.weight)
+
+    grads_abs = get_layer_metric_array(net, synflow, mode)
+
+    # apply signs of all params
+    nonlinearize(net, signs)
+
+    return grads_abs
+
+

zero-cost-nas/foresight/pruners/measures/var.py

@@ -0,0 +1,55 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+import time
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+
+from . import measure
+
+
+def get_score(net, x, target, device, split_data):
+    result_list = []
+    def forward_hook(module, data_input, data_output):
+        var = torch.var(data_input[0])
+        result_list.append(var)
+    net.classifier.register_forward_hook(forward_hook)
+
+    N = x.shape[0]
+    for sp in range(split_data):
+        st = sp * N // split_data
+        en = (sp + 1) * N // split_data
+        y = net(x[st:en])
+    v = result_list[0].item()
+    result_list.clear()
+    return v
+
+
+
+@measure('var', bn=True)
+def compute_var(net, inputs, targets, split_data=1, loss_fn=None):
+    device = inputs.device
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    # print('var:', feature.shape)
+    try:
+        var= get_score(net, inputs, targets, device, split_data=split_data)
+    except Exception as e:
+        print(e)
+        var= np.nan
+    # print(jc)
+    # print(f'var time: {t} s')
+    return var

zero-cost-nas/foresight/pruners/measures/zico.py

@@ -0,0 +1,106 @@
+# Copyright 2021 Samsung Electronics Co., Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+import time
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# =============================================================================
+
+import numpy as np
+import torch
+
+from . import measure
+from torch import nn
+
+from ...dataset import get_cifar_dataloaders
+
+
+def getgrad(model: torch.nn.Module, grad_dict: dict, step_iter=0):
+    if step_iter == 0:
+        for name, mod in model.named_modules():
+            if isinstance(mod, nn.Conv2d) or isinstance(mod, nn.Linear):
+                # print(mod.weight.grad.data.size())
+                # print(mod.weight.data.size())
+                try:
+                    grad_dict[name] = [mod.weight.grad.data.cpu().reshape(-1).numpy()]
+                except:
+                    continue
+    else:
+        for name, mod in model.named_modules():
+            if isinstance(mod, nn.Conv2d) or isinstance(mod, nn.Linear):
+                try:
+                    grad_dict[name].append(mod.weight.grad.data.cpu().reshape(-1).numpy())
+                except:
+                    continue
+    return grad_dict
+
+
+def caculate_zico(grad_dict):
+    allgrad_array = None
+    for i, modname in enumerate(grad_dict.keys()):
+        grad_dict[modname] = np.array(grad_dict[modname])
+    nsr_mean_sum = 0
+    nsr_mean_sum_abs = 0
+    nsr_mean_avg = 0
+    nsr_mean_avg_abs = 0
+    for j, modname in enumerate(grad_dict.keys()):
+        nsr_std = np.std(grad_dict[modname], axis=0)
+        # print(grad_dict[modname].shape)
+        # print(grad_dict[modname].shape, nsr_std.shape)
+        nonzero_idx = np.nonzero(nsr_std)[0]
+        nsr_mean_abs = np.mean(np.abs(grad_dict[modname]), axis=0)
+        tmpsum = np.sum(nsr_mean_abs[nonzero_idx] / nsr_std[nonzero_idx])
+        if tmpsum == 0:
+            pass
+        else:
+            nsr_mean_sum_abs += np.log(tmpsum)
+            nsr_mean_avg_abs += np.log(np.mean(nsr_mean_abs[nonzero_idx] / nsr_std[nonzero_idx]))
+    return nsr_mean_sum_abs
+
+
+def getzico(network, inputs, targets, loss_fn, split_data=2):
+    grad_dict = {}
+    network.train()
+    device = inputs.device
+    network.to(device)
+    N = inputs.shape[0]
+    split_data = 2
+
+    for sp in range(split_data):
+        st = sp * N // split_data
+        en = (sp + 1) * N // split_data
+        outputs = network.forward(inputs[st:en])
+        loss = loss_fn(outputs, targets[st:en])
+        loss.backward()
+        grad_dict = getgrad(network, grad_dict, sp)
+    # print(grad_dict)
+    res = caculate_zico(grad_dict)
+    return res
+
+
+
+
+
+@measure('zico', bn=True)
+def compute_zico(net, inputs, targets, split_data=2, loss_fn=None):
+
+    # Compute gradients (but don't apply them)
+    net.zero_grad()
+
+    # print('var:', feature.shape)
+    try:
+        zico = getzico(net, inputs, targets, loss_fn, split_data=split_data)
+    except Exception as e:
+        print(e)
+        zico= np.nan
+    # print(jc)
+    # print(f'var time: {t} s')
+    return zico