def __init__(self):
super(CNNLenet, self).__init__()
self.conv1 = nn. Sequential(
nn.Conv2d(1,16, 5,1,2),
nn.ReLU(),
nn.MaxPool2d(2)
)
self.conv2 = nn.Sequential(
nn.Conv2d(16, 32, 5, 1, 2),
nn.ReLU(),
nn.MaxPool2d(2)
)
# fully connected layer, output 10 classes
self.fc1 = nn.Linear(32 * 7 * 7, 10)
def forward(self, x):
x = self.conv1(x)
x = self.conv2(x)
# flatten the output of conv2 to (batch_size, 32 * 7 * 7)
x = x.view(x.size(0), -1)
output = self.fc1(x)
return output, x # return x for visualization
Here is optimization loop
```for epoch in range(2): # loop over the dataset multiple times
running_loss = 0.0
for i, data in enumerate(train_loader, 0):
# get the inputs; data is a list of [inputs, labels]
inputs, labels = data
# zero the parameter gradients
optimizer.zero_grad()
# forward + backward + optimize
outputs = model(inputs)
loss = criterion(outputs, labels)
loss.backward()
optimizer.step()
# print statistics
running_loss += loss.item()
if i % 2000 == 1999: # print every 2000 mini-batches
print('[%d, %5d] loss: %.3f' %
(epoch + 1, i + 1, running_loss / 2000))
running_loss = 0.0
print('Finished Training')
``` ---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-23-458279d9b112> in <module>
11 # forward + backward + optimize
12 outputs = model(inputs)
---> 13 loss = criterion(outputs, labels)
14
15 loss.backward()
~\anaconda3\envs\deeplearning\lib\site-packages\torch\nn\modules\module.py in _call_impl(self, *input, **kwargs)
1049 if not (self._backward_hooks or self._forward_hooks or self._forward_pre_hooks or _global_backward_hooks
1050 or _global_forward_hooks or _global_forward_pre_hooks):
-> 1051 return forward_call(*input, **kwargs)
1052 # Do not call functions when jit is used
1053 full_backward_hooks, non_full_backward_hooks = [], []
~\anaconda3\envs\deeplearning\lib\site-packages\torch\nn\modules\loss.py in forward(self, input, target)
1118
1119 def forward(self, input: Tensor, target: Tensor) -> Tensor:
-> 1120 return F.cross_entropy(input, target, weight=self.weight,
1121 ignore_index=self.ignore_index, reduction=self.reduction)
1122
~\anaconda3\envs\deeplearning\lib\site-packages\torch\nn\functional.py in cross_entropy(input, target, weight, size_average, ignore_index, reduce, reduction)
2822 if size_average is not None or reduce is not None:
2823 reduction = _Reduction.legacy_get_string(size_average, reduce)
-> 2824 return torch._C._nn.cross_entropy_loss(input, target, weight, _Reduction.get_enum(reduction), ignore_index)
2825
2826
TypeError: cross_entropy_loss(): argument 'input' (position 1) must be Tensor, not tuple
I am unable to understand this error. Kindly help me in understanding and resolving it.
3 Likes
The forward method of your model returns a tuple via:
return output, x # return x for visualization
which creates the issue in loss = criterion(outputs, labels).
I assume you want to use output to calculate the loss, so use:
output, x = model(inputs)
loss = criterion(output, labels)
and it should work.
4 Likes
Hi @ptrblck I got the same error using the code : share_to_resolve - Google Docs
return F.cross_entropy(input, target, weight=self.weight,
File “/home/charchit/miniconda3/envs/irt_project/lib/python3.9/site-packages/torch/nn/functional.py”, line 2996, in cross_entropy
return torch._C._nn.cross_entropy_loss(input, target, weight, _Reduction.get_enum(reduction), ignore_index, label_smoothing)
TypeError: cross_entropy_loss(): argument ‘input’ (position 1) must be Tensor, not tuple
Can you please help me here! @ptrblck
# coding=utf-8
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import copy
import logging
import math
from os.path import join as pjoin
import torch
import torch.nn as nn
import numpy as np
from torch.nn import CrossEntropyLoss, Dropout, Softmax, Linear, Conv2d, LayerNorm
from torch.nn.modules.utils import _pair
from scipy import ndimage
import models.configs as configs
from .modeling_resnet import ResNetV2
logger = logging.getLogger(__name__)
ATTENTION_Q = "MultiHeadDotProductAttention_1/query"
ATTENTION_K = "MultiHeadDotProductAttention_1/key"
ATTENTION_V = "MultiHeadDotProductAttention_1/value"
ATTENTION_OUT = "MultiHeadDotProductAttention_1/out"
FC_0 = "MlpBlock_3/Dense_0"
FC_1 = "MlpBlock_3/Dense_1"
ATTENTION_NORM = "LayerNorm_0"
MLP_NORM = "LayerNorm_2"
def np2th(weights, conv=False):
"""Possibly convert HWIO to OIHW."""
if conv:
weights = weights.transpose([3, 2, 0, 1])
return torch.from_numpy(weights)
def swish(x):
return x * torch.sigmoid(x)
ACT2FN = {"gelu": torch.nn.functional.gelu, "relu": torch.nn.functional.relu, "swish": swish}
class Attention(nn.Module):
def __init__(self, config, vis):
super(Attention, self).__init__()
self.vis = vis
self.num_attention_heads = config.transformer["num_heads"]
self.attention_head_size = int(config.hidden_size / self.num_attention_heads)
self.all_head_size = self.num_attention_heads * self.attention_head_size
self.query = Linear(config.hidden_size, self.all_head_size)
self.key = Linear(config.hidden_size, self.all_head_size)
self.value = Linear(config.hidden_size, self.all_head_size)
self.out = Linear(config.hidden_size, config.hidden_size)
self.attn_dropout = Dropout(config.transformer["attention_dropout_rate"])
self.proj_dropout = Dropout(config.transformer["attention_dropout_rate"])
self.softmax = Softmax(dim=-1)
def transpose_for_scores(self, x):
new_x_shape = x.size()[:-1] + (self.num_attention_heads, self.attention_head_size)
x = x.view(*new_x_shape)
return x.permute(0, 2, 1, 3)
def forward(self, hidden_states):
mixed_query_layer = self.query(hidden_states)
mixed_key_layer = self.key(hidden_states)
mixed_value_layer = self.value(hidden_states)
query_layer = self.transpose_for_scores(mixed_query_layer)
key_layer = self.transpose_for_scores(mixed_key_layer)
value_layer = self.transpose_for_scores(mixed_value_layer)
attention_scores = torch.matmul(query_layer, key_layer.transpose(-1, -2))
attention_scores = attention_scores / math.sqrt(self.attention_head_size)
attention_probs = self.softmax(attention_scores)
weights = attention_probs if self.vis else None
attention_probs = self.attn_dropout(attention_probs)
context_layer = torch.matmul(attention_probs, value_layer)
context_layer = context_layer.permute(0, 2, 1, 3).contiguous()
new_context_layer_shape = context_layer.size()[:-2] + (self.all_head_size,)
context_layer = context_layer.view(*new_context_layer_shape)
attention_output = self.out(context_layer)
attention_output = self.proj_dropout(attention_output)
return attention_output, weights
class Mlp(nn.Module):
def __init__(self, config):
super(Mlp, self).__init__()
self.fc1 = Linear(config.hidden_size, config.transformer["mlp_dim"])
self.fc2 = Linear(config.transformer["mlp_dim"], config.hidden_size)
self.act_fn = ACT2FN["gelu"]
self.dropout = Dropout(config.transformer["dropout_rate"])
self._init_weights()
def _init_weights(self):
nn.init.xavier_uniform_(self.fc1.weight)
nn.init.xavier_uniform_(self.fc2.weight)
nn.init.normal_(self.fc1.bias, std=1e-6)
nn.init.normal_(self.fc2.bias, std=1e-6)
def forward(self, x):
x = self.fc1(x)
x = self.act_fn(x)
x = self.dropout(x)
x = self.fc2(x)
x = self.dropout(x)
return x
class Embeddings(nn.Module):
"""Construct the embeddings from patch, position embeddings.
"""
def __init__(self, config, img_size, in_channels=3):
super(Embeddings, self).__init__()
self.hybrid = None
img_size = _pair(img_size)
if config.patches.get("grid") is not None:
grid_size = config.patches["grid"]
patch_size = (img_size[0] // 16 // grid_size[0], img_size[1] // 16 // grid_size[1])
n_patches = (img_size[0] // 16) * (img_size[1] // 16)
self.hybrid = True
else:
patch_size = _pair(config.patches["size"])
n_patches = (img_size[0] // patch_size[0]) * (img_size[1] // patch_size[1])
self.hybrid = False
if self.hybrid:
self.hybrid_model = ResNetV2(block_units=config.resnet.num_layers,
width_factor=config.resnet.width_factor)
in_channels = self.hybrid_model.width * 16
self.patch_embeddings = Conv2d(in_channels=in_channels,
out_channels=config.hidden_size,
kernel_size=patch_size,
stride=patch_size)
self.position_embeddings = nn.Parameter(torch.zeros(1, n_patches+1, config.hidden_size))
self.cls_token = nn.Parameter(torch.zeros(1, 1, config.hidden_size))
self.dropout = Dropout(config.transformer["dropout_rate"])
def forward(self, x):
B = x.shape[0]
cls_tokens = self.cls_token.expand(B, -1, -1)
if self.hybrid:
x = self.hybrid_model(x)
x = self.patch_embeddings(x)
x = x.flatten(2)
x = x.transpose(-1, -2)
x = torch.cat((cls_tokens, x), dim=1)
embeddings = x + self.position_embeddings
embeddings = self.dropout(embeddings)
return embeddings
class Block(nn.Module):
def __init__(self, config, vis):
super(Block, self).__init__()
self.hidden_size = config.hidden_size
self.attention_norm = LayerNorm(config.hidden_size, eps=1e-6)
self.ffn_norm = LayerNorm(config.hidden_size, eps=1e-6)
self.ffn = Mlp(config)
self.attn = Attention(config, vis)
def forward(self, x):
h = x
x = self.attention_norm(x)
x, weights = self.attn(x)
x = x + h
h = x
x = self.ffn_norm(x)
x = self.ffn(x)
x = x + h
return x, weights
def load_from(self, weights, n_block):
ROOT = f"Transformer/encoderblock_{n_block}"
with torch.no_grad():
query_weight = np2th(weights[pjoin(ROOT, ATTENTION_Q, "kernel")]).view(self.hidden_size, self.hidden_size).t()
key_weight = np2th(weights[pjoin(ROOT, ATTENTION_K, "kernel")]).view(self.hidden_size, self.hidden_size).t()
value_weight = np2th(weights[pjoin(ROOT, ATTENTION_V, "kernel")]).view(self.hidden_size, self.hidden_size).t()
out_weight = np2th(weights[pjoin(ROOT, ATTENTION_OUT, "kernel")]).view(self.hidden_size, self.hidden_size).t()
query_bias = np2th(weights[pjoin(ROOT, ATTENTION_Q, "bias")]).view(-1)
key_bias = np2th(weights[pjoin(ROOT, ATTENTION_K, "bias")]).view(-1)
value_bias = np2th(weights[pjoin(ROOT, ATTENTION_V, "bias")]).view(-1)
out_bias = np2th(weights[pjoin(ROOT, ATTENTION_OUT, "bias")]).view(-1)
self.attn.query.weight.copy_(query_weight)
self.attn.key.weight.copy_(key_weight)
self.attn.value.weight.copy_(value_weight)
self.attn.out.weight.copy_(out_weight)
self.attn.query.bias.copy_(query_bias)
self.attn.key.bias.copy_(key_bias)
self.attn.value.bias.copy_(value_bias)
self.attn.out.bias.copy_(out_bias)
mlp_weight_0 = np2th(weights[pjoin(ROOT, FC_0, "kernel")]).t()
mlp_weight_1 = np2th(weights[pjoin(ROOT, FC_1, "kernel")]).t()
mlp_bias_0 = np2th(weights[pjoin(ROOT, FC_0, "bias")]).t()
mlp_bias_1 = np2th(weights[pjoin(ROOT, FC_1, "bias")]).t()
self.ffn.fc1.weight.copy_(mlp_weight_0)
self.ffn.fc2.weight.copy_(mlp_weight_1)
self.ffn.fc1.bias.copy_(mlp_bias_0)
self.ffn.fc2.bias.copy_(mlp_bias_1)
self.attention_norm.weight.copy_(np2th(weights[pjoin(ROOT, ATTENTION_NORM, "scale")]))
self.attention_norm.bias.copy_(np2th(weights[pjoin(ROOT, ATTENTION_NORM, "bias")]))
self.ffn_norm.weight.copy_(np2th(weights[pjoin(ROOT, MLP_NORM, "scale")]))
self.ffn_norm.bias.copy_(np2th(weights[pjoin(ROOT, MLP_NORM, "bias")]))
class Encoder(nn.Module):
def __init__(self, config, vis):
super(Encoder, self).__init__()
self.vis = vis
self.layer = nn.ModuleList()
self.encoder_norm = LayerNorm(config.hidden_size, eps=1e-6)
for _ in range(config.transformer["num_layers"]):
layer = Block(config, vis)
self.layer.append(copy.deepcopy(layer))
def forward(self, hidden_states):
attn_weights = []
for layer_block in self.layer:
hidden_states, weights = layer_block(hidden_states)
if self.vis:
attn_weights.append(weights)
encoded = self.encoder_norm(hidden_states)
return encoded, attn_weights
class Transformer(nn.Module):
def __init__(self, config, img_size, vis):
super(Transformer, self).__init__()
self.embeddings = Embeddings(config, img_size=img_size)
self.encoder = Encoder(config, vis)
def forward(self, input_ids):
embedding_output = self.embeddings(input_ids)
encoded, attn_weights = self.encoder(embedding_output)
return encoded, attn_weights
class VisionTransformer(nn.Module):
def __init__(self, config, img_size=224, num_classes=21843, zero_head=False, vis=False):
super(VisionTransformer, self).__init__()
self.num_classes = num_classes
self.zero_head = zero_head
self.classifier = config.classifier
self.transformer = Transformer(config, img_size, vis)
self.head = Linear(config.hidden_size, num_classes)
def forward(self, x, labels=None):
x, attn_weights = self.transformer(x)
logits = self.head(x[:, 0])
if labels is not None:
loss_fct = CrossEntropyLoss()
loss = loss_fct(logits.view(-1, self.num_classes), labels.view(-1))
return loss
else:
print("In forward else")
return logits, attn_weights
def load_from(self, weights):
with torch.no_grad():
if self.zero_head:
nn.init.zeros_(self.head.weight)
nn.init.zeros_(self.head.bias)
else:
self.head.weight.copy_(np2th(weights["head/kernel"]).t())
self.head.bias.copy_(np2th(weights["head/bias"]).t())
self.transformer.embeddings.patch_embeddings.weight.copy_(np2th(weights["embedding/kernel"], conv=True))
class VisionTransformer(nn.Module):
def __init__(self, config, img_size=224, num_classes=21843, zero_head=False, vis=False):
super(VisionTransformer, self).__init__()
self.num_classes = num_classes
self.zero_head = zero_head
self.classifier = config.classifier
self.transformer = Transformer(config, img_size, vis)
self.head = Linear(config.hidden_size, num_classes)
def forward(self, x, labels=None):
x, attn_weights = self.transformer(x)
logits = self.head(x[:, 0])
if labels is not None:
loss_fct = CrossEntropyLoss()
loss = loss_fct(logits.view(-1, self.num_classes), labels.view(-1))
return loss
else:
print("In forward else")
return logits, attn_weights
````Preformatted text`
Is the issue because I need to only work with logits. So, in outputs[0] is okay. I am confused@ptrblckI don’t know which output you are using in the loss calculation, but as the error states a tensor is expected as the input argument (i.e. your model output) while a tuple is passed.
1 Like