def __getPosCode(self,fm_sz,out_c): x = [] for i in range(fm_sz): x.append([np.sin,np.cos][i % 2](1 / (10000 ** (i // 2 / fm_sz)))) x = torch.from_numpy(np.array([x])).float() return torch.cat([(x + x.t()).unsqueeze(0) for i in range(out_c)])
时间: 2024-01-29 19:02:12 浏览: 34
以下是将`__getPosCode`函数转换为TensorFlow的代码:
```python
import tensorflow as tf
import numpy as np
def get_pos_code(fm_sz, out_c):
x = []
for i in range(fm_sz):
x.append([np.sin, np.cos][i % 2](1 / (10000 ** (i // 2 / fm_sz))))
x = np.array([x], dtype=np.float32)
x = tf.constant(x)
x = tf.transpose(x, perm=[0, 2, 1])
x = tf.tile(x, [1, out_c, 1])
x_t = tf.transpose(x, perm=[0, 2, 1])
return tf.concat([x + x_t, tf.zeros_like(x)], axis=0)
```
这里同样使用了常量、转置和复制操作,但是需要注意的是,在拼接时,需要将一个全零的张量作为第二个参数传递给`tf.concat`函数,并指定拼接的维度为0。这是因为在PyTorch中,`x + x.t()`和`torch.zeros_like(x)`具有相同的形状,但是在TensorFlow中,这两个张量的形状不同,需要使用`tf.zeros_like`函数来创建一个相同形状的全零张量。
相关问题
用tensorflow的layers.Layer模块改写class SelfAttention(nn.Module): def init(self,in_c,out_c,fm_sz,pos_bias = False): super(SelfAttention,self).init() self.w_q = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.w_k = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.w_v = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.pos_code = self.__getPosCode(fm_sz,out_c) self.softmax = nn.Softmax(dim = 2) self.pos_bias = pos_bias def __getPosCode(self,fm_sz,out_c): x = [] for i in range(fm_sz): x.append([np.sin,np.cos][i % 2](1 / (10000 ** (i // 2 / fm_sz)))) x = torch.from_numpy(np.array([x])).float() return torch.cat([(x + x.t()).unsqueeze(0) for i in range(out_c)]) def forward(self,x): q,k,v = self.w_q(x),self.w_k(x),self.w_v(x) pos_code = torch.cat([self.pos_code.unsqueeze(0) for i in range(x.shape[0])]).to(x.device) if self.pos_bias: att_map = torch.matmul(q,k.permute(0,1,3,2)) + pos_code else: att_map = torch.matmul(q,k.permute(0,1,3,2)) + torch.matmul(q,pos_code.permute(0,1,3,2)) am_shape = att_map.shape att_map = self.softmax(att_map.view(am_shape[0],am_shape[1],am_shape[2] * am_shape[3])).view(am_shape) return att_map * v
以下是使用tensorflow的layers.Layer模块改写的代码:
```
import tensorflow as tf
class SelfAttention(tf.keras.layers.Layer):
def __init__(self, in_c, out_c, fm_sz, pos_bias=False):
super(SelfAttention, self).__init__()
self.w_q = tf.keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=[None, None, in_c])
self.w_k = tf.keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=[None, None, in_c])
self.w_v = tf.keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=[None, None, in_c])
self.pos_code = self.__getPosCode(fm_sz, out_c)
self.softmax = tf.keras.layers.Softmax(axis=2)
self.pos_bias = pos_bias
def __getPosCode(self, fm_sz, out_c):
x = []
for i in range(fm_sz):
x.append([np.sin, np.cos][i % 2](1 / (10000 ** (i // 2 / fm_sz))))
x = np.array([x], dtype=np.float32)
return tf.concat([(x + tf.transpose(x)).unsqueeze(0) for i in range(out_c)], axis=0)
def call(self, x):
q, k, v = self.w_q(x), self.w_k(x), self.w_v(x)
pos_code = tf.concat([self.pos_code[None, ...] for i in range(tf.shape(x)[0])], axis=0)
if self.pos_bias:
att_map = tf.matmul(q, tf.transpose(k, perm=[0, 1, 3, 2])) + pos_code
else:
att_map = tf.matmul(q, tf.transpose(k, perm=[0, 1, 3, 2])) + tf.matmul(q, tf.transpose(pos_code, perm=[0, 1, 3, 2]))
am_shape = tf.shape(att_map)
att_map = self.softmax(tf.reshape(att_map, [am_shape[0], am_shape[1], am_shape[2] * am_shape[3]]))
att_map = tf.reshape(att_map, am_shape)
return att_map * v
```
需要注意的是,tensorflow中没有nn.Module这个概念,而是使用tf.keras.layers.Layer作为基类。因此,我们需要在类定义中加入`tf.keras.layers.Layer`,并对一些函数名称进行修改。此外,tensorflow默认使用NHWC格式的数据,因此在调用transpose函数时需要加上perm参数进行转置,以保证维度的正确性。
class SelfAttention(nn.Module): def __init__(self,in_c,out_c,fm_sz,pos_bias = False): super(SelfAttention,self).__init__() self.w_q = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.w_k = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.w_v = nn.Conv2d(in_channels = in_c,out_channels = out_c,kernel_size = 1) self.pos_code = self.__getPosCode(fm_sz,out_c) self.softmax = nn.Softmax(dim = 2) self.pos_bias = pos_bias 改写为twensorflow形式
可以将这段PyTorch代码改写为如下的TensorFlow代码:
```python
import tensorflow as tf
from tensorflow import keras
class SelfAttention(keras.layers.Layer):
def __init__(self, in_c, out_c, fm_sz, pos_bias=False):
super(SelfAttention, self).__init__()
self.w_q = keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=(None, None, in_c))
self.w_k = keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=(None, None, in_c))
self.w_v = keras.layers.Conv2D(filters=out_c, kernel_size=1, input_shape=(None, None, in_c))
self.pos_code = self.__getPosCode(fm_sz, out_c)
self.softmax = keras.layers.Softmax(axis=2)
self.pos_bias = pos_bias
def __getPosCode(self, fm_sz, out_c):
x = []
for i in range(fm_sz):
x.append([np.sin, np.cos][i % 2](1 / (10000 ** (i // 2 / fm_sz))))
x = tf.convert_to_tensor([x], dtype=tf.float32)
return tf.concat([(x + tf.transpose(x)).unsqueeze(0) for i in range(out_c)], axis=0)
def call(self, x):
q, k, v = self.w_q(x), self.w_k(x), self.w_v(x)
pos_code = tf.concat([self.pos_code.unsqueeze(0) for i in range(x.shape[0])], axis=0)
if self.pos_bias:
att_map = tf.matmul(q, tf.transpose(k, perm=[0, 1, 3, 2])) + pos_code
else:
att_map = tf.matmul(q, tf.transpose(k, perm=[0, 1, 3, 2])) + tf.matmul(q, tf.transpose(pos_code, perm=[0, 1, 3, 2]))
am_shape = att_map.shape
att_map = self.softmax(tf.reshape(att_map, [am_shape[0], am_shape[1], am_shape[2] * am_shape[3]]))
att_map = tf.reshape(att_map, am_shape)
return att_map * v
```
需要注意的是,这里的代码只是一种可能的TensorFlow实现方式,具体还需要根据实际情况进行微调。
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