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synced 2025-10-20 13:23:46 +08:00
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wyy4github
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BIN
Image/输出20.PNG
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@ -2,7 +2,63 @@
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||||
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||||
## 什么是Autograd
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||||
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||||
Autograd(自动微分) 包是 PyTorch 中所有神经网络的核心。该 autograd 软件包为 Tensors 上的所有操作提供自动微分。它是一个
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||||
由运行定义的框架，这意味着以代码运行方式定义你的后向传播，并且每次迭代都可以不同。
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||||
Autograd(自动微分) 包是 PyTorch 中所有神经网络的核心。Tensor是PyTorch实现多维数组计算和自动微分的关键数据结构，关于
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||||
Tensor的各种数学运算，上一小节已做说明。本小节主要讲Tensor提供的自动微分，记录作用于Tensor上的所有操作，用于后续的梯度计算，这意味着以代码运行方式定义你的后向传播，并且每次迭代都可以不同。
|
||||
Autograd机制记录作用于Tensor上的所有操作，生成一个动态计算图。图的叶子节点是输入的数据，根节点是输出的结果。当在
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||||
根节点调用.backward()的时候就会从根到叶应用链式法则计算梯度。默认情况下，只有.requires_grad和is_leaf两个属性都为True的
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节点才会被计算导数，并存储到grad中。
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||||
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||||
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||||
### requires_grad属性
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||||
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requires_grad属性默认为False，如果一个节点的requires_grad是True，那么所有依赖它的节点requires_grad也会是True。
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||||
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||||
```buildoutcfg
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||||
x = torch.randn(5, 5) # requires_grad=False by default
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||||
y = torch.randn(5, 5) # requires_grad=False by default
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z = torch.randn((5, 5), requires_grad=True)
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||||
a = x + y
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print(a.requires_grad)
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||||
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||||
b = a + z
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print(b.requires_grad)
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||||
```
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||||
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||||
输出结果：
|
||||
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||||
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||||
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||||
### Function类
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||||
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||||
每当对Tensor施加一个运算的时候，就会产生一个Function对象，它产生运算的结果，记录运算的发生，并且记录运算的输入。
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||||
Tensor使用.grad_fn属性记录这个计算图的入口。反向传播过程中，autograd引擎会按照逆序，通过Function的backward依次计算梯度。
|
||||
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||||
<h4>1.backward()函数计算张量的梯度之和
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||||
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||||
参数tensors如果是标量,函数backward计算参数tensors对于给定图叶子节点的梯度。参数tensors如果不是标量，需要另外指定参
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||||
数grad_tensors，参数grad_tensors必须和参数tensors的长度相同。这种情况下将计算雅可比矢量乘积。
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||||
每次backward之前，需要注意叶子梯度节点是否清零，如果没有清零，第二次backward会累计上一次的梯度。
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||||
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||||
```buildoutcfg
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||||
x=torch.randn((3),dtype=torch.float32,requires_grad=True)
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y = torch.randn((3),dtype=torch.float32,requires_grad=True)
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z = torch.randn((3),dtype=torch.float32,requires_grad=True)
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t = x + y
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||||
loss = t.dot(z) #求向量的内积
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loss.backward(retain_graph=True)
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print(z,x.grad,y.grad)
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print(t,z.grad)
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||||
print(t.grad)
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||||
```
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||||
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||||
我们手动计算上面代码的导数可得为z，所以预期结果中z=x.grad=y.grad ; t=z.grad，且t为非叶子节点，即t.grad=None
|
||||
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||||
输出结果：
|
||||
|
||||
|
||||
|
||||
<h4>2.detach()函数停止记录在tensor上的操作
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||||
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<h4>3.grad()函数累计输入的梯度
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@ -129,7 +129,7 @@ print(y)
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||||
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||||
注意：任何使张量发生变化的操作都有一个前缀'_'。例如：x_copy_(y),x_t()，将会改变x
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||||
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||||
#### 绝对值运算
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||||
### 绝对值运算
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||||
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<h4> torch.abs()输出全部张量元素的绝对值
|
||||
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||||
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||||
210
hs_err_pid119532.log
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210
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@ -0,0 +1,210 @@
|
||||
#
|
||||
# There is insufficient memory for the Java Runtime Environment to continue.
|
||||
# Native memory allocation (mmap) failed to map 134217728 bytes for Failed to commit area from 0x0000000081600000 to 0x0000000089600000 of length 134217728.
|
||||
# Possible reasons:
|
||||
# The system is out of physical RAM or swap space
|
||||
# The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap
|
||||
# Possible solutions:
|
||||
# Reduce memory load on the system
|
||||
# Increase physical memory or swap space
|
||||
# Check if swap backing store is full
|
||||
# Decrease Java heap size (-Xmx/-Xms)
|
||||
# Decrease number of Java threads
|
||||
# Decrease Java thread stack sizes (-Xss)
|
||||
# Set larger code cache with -XX:ReservedCodeCacheSize=
|
||||
# This output file may be truncated or incomplete.
|
||||
#
|
||||
# Out of Memory Error (c:/BuildAgent/work/dd4f663211fab7c/src/hotspot/os/windows/os_windows.cpp:3272), pid=119532, tid=119116
|
||||
#
|
||||
# JRE version: (11.0.2+9) (build )
|
||||
# Java VM: OpenJDK 64-Bit Server VM (11.0.2+9-b159.34, mixed mode, aot, sharing, tiered, compressed oops, g1 gc, windows-amd64)
|
||||
# No core dump will be written. Minidumps are not enabled by default on client versions of Windows
|
||||
#
|
||||
|
||||
--------------- S U M M A R Y ------------
|
||||
|
||||
Command Line: org.jetbrains.git4idea.http.GitAskPassApp Username for 'https://github.com':
|
||||
|
||||
Host: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz, 8 cores, 7G, Windows 7 , 64 bit Build 7601 (6.1.7601.24441)
|
||||
Time: Sun May 26 00:05:04 2019 ?D1<44><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?<3F><><EFBFBD><EFBFBD>?? elapsed time: 0 seconds (0d 0h 0m 0s)
|
||||
|
||||
--------------- T H R E A D ---------------
|
||||
|
||||
Current thread (0x0000000000317000): JavaThread "Unknown thread" [_thread_in_vm, id=119116, stack(0x0000000002240000,0x0000000002340000)]
|
||||
|
||||
Stack: [0x0000000002240000,0x0000000002340000]
|
||||
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
|
||||
V [jvm.dll+0x5da82a]
|
||||
V [jvm.dll+0x70b6c9]
|
||||
V [jvm.dll+0x70cbe8]
|
||||
V [jvm.dll+0x70d2b3]
|
||||
V [jvm.dll+0x240f18]
|
||||
V [jvm.dll+0x5d7fc4]
|
||||
V [jvm.dll+0x5cd115]
|
||||
V [jvm.dll+0x2fa5eb]
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||||
V [jvm.dll+0x2fa55a]
|
||||
V [jvm.dll+0x2fa432]
|
||||
V [jvm.dll+0x2ff316]
|
||||
V [jvm.dll+0x347993]
|
||||
V [jvm.dll+0x348096]
|
||||
V [jvm.dll+0x347a93]
|
||||
V [jvm.dll+0x2d5588]
|
||||
V [jvm.dll+0x2d66c7]
|
||||
V [jvm.dll+0x6eaac7]
|
||||
V [jvm.dll+0x6ec22c]
|
||||
V [jvm.dll+0x3551c9]
|
||||
V [jvm.dll+0x6d274e]
|
||||
V [jvm.dll+0x3bd953]
|
||||
V [jvm.dll+0x3bfcc1]
|
||||
C [java.exe+0x3763]
|
||||
C [java.exe+0x17a0c]
|
||||
C [kernel32.dll+0x1556d]
|
||||
C [ntdll.dll+0x5385d]
|
||||
|
||||
|
||||
--------------- P R O C E S S ---------------
|
||||
|
||||
Threads class SMR info:
|
||||
_java_thread_list=0x00000000002f9910, length=0, elements={
|
||||
}
|
||||
|
||||
Java Threads: ( => current thread )
|
||||
|
||||
Other Threads:
|
||||
0x0000000000330800 GCTaskThread "GC Thread#0" [stack: 0x0000000014cc0000,0x0000000014dc0000] [id=118392]
|
||||
0x0000000000364800 ConcurrentGCThread "G1 Main Marker" [stack: 0x000000001a210000,0x000000001a310000] [id=119528]
|
||||
0x0000000000365800 ConcurrentGCThread "G1 Conc#0" [stack: 0x000000001a3a0000,0x000000001a4a0000] [id=119664]
|
||||
|
||||
[error occurred during error reporting (printing all threads), id 0xc0000005, EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007fee4645687]
|
||||
|
||||
VM state:not at safepoint (not fully initialized)
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||||
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||||
VM Mutex/Monitor currently owned by a thread: ([mutex/lock_event])
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||||
[0x00000000003149a0] Heap_lock - owner thread: 0x0000000000317000
|
||||
|
||||
Heap address: 0x0000000081600000, size: 2026 MB, Compressed Oops mode: Non-zero based: 0x0000000081600000
|
||||
Narrow klass base: 0x0000000000000000, Narrow klass shift: 0
|
||||
|
||||
GC Heap History (0 events):
|
||||
No events
|
||||
|
||||
Deoptimization events (0 events):
|
||||
No events
|
||||
|
||||
Classes redefined (0 events):
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||||
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||||
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||||
Internal exceptions (0 events):
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||||
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||||
|
||||
Events (0 events):
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||||
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||||
|
||||
|
||||
Dynamic libraries:
|
||||
0x000000013ff80000 - 0x000000013ffc7000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\java.exe
|
||||
0x0000000077740000 - 0x00000000778df000 C:\Windows\SYSTEM32\ntdll.dll
|
||||
0x0000000077520000 - 0x000000007763f000 C:\Windows\system32\kernel32.dll
|
||||
0x000007fefd260000 - 0x000007fefd2ca000 C:\Windows\system32\KERNELBASE.dll
|
||||
0x0000000077640000 - 0x000000007773a000 C:\Windows\system32\USER32.dll
|
||||
0x000007fefd5e0000 - 0x000007fefd647000 C:\Windows\system32\GDI32.dll
|
||||
0x000007fefe210000 - 0x000007fefe21e000 C:\Windows\system32\LPK.dll
|
||||
0x000007feff960000 - 0x000007feffa2b000 C:\Windows\system32\USP10.dll
|
||||
0x000007fefd730000 - 0x000007fefd7cf000 C:\Windows\system32\msvcrt.dll
|
||||
0x000007fefb9e0000 - 0x000007fefbbd5000 C:\Windows\WinSxS\amd64_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.24440_none_e36f1bbf30ff0606\COMCTL32.dll
|
||||
0x000007fefe060000 - 0x000007fefe0d1000 C:\Windows\system32\SHLWAPI.dll
|
||||
0x000007feff560000 - 0x000007feff58e000 C:\Windows\system32\IMM32.DLL
|
||||
0x000007fefd7d0000 - 0x000007fefd8d9000 C:\Windows\system32\MSCTF.dll
|
||||
0x000007fef4a10000 - 0x000007fef4a13000 C:\Windows\system32\api-ms-win-core-synch-l1-2-0.DLL
|
||||
0x000007fef5ea0000 - 0x000007fef5eb7000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\vcruntime140.dll
|
||||
0x000007fef4960000 - 0x000007fef4964000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-runtime-l1-1-0.dll
|
||||
0x000007fee8410000 - 0x000007fee850a000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\ucrtbase.DLL
|
||||
0x000007feef160000 - 0x000007feef163000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-core-localization-l1-2-0.dll
|
||||
0x000007feef180000 - 0x000007feef183000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-core-processthreads-l1-1-1.dll
|
||||
0x000007feeacf0000 - 0x000007feeacf3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-core-file-l1-2-0.dll
|
||||
0x000007feead00000 - 0x000007feead03000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-core-timezone-l1-1-0.dll
|
||||
0x000007fee8fd0000 - 0x000007fee8fd3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-core-file-l2-1-0.dll
|
||||
0x000007fef4870000 - 0x000007fef4874000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-string-l1-1-0.dll
|
||||
0x000007fef4860000 - 0x000007fef4863000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-heap-l1-1-0.dll
|
||||
0x000007fef4850000 - 0x000007fef4854000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-stdio-l1-1-0.dll
|
||||
0x000007fef4100000 - 0x000007fef4104000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-convert-l1-1-0.dll
|
||||
0x000007feef090000 - 0x000007feef12d000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\msvcp140.dll
|
||||
0x000007feef070000 - 0x000007feef073000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-locale-l1-1-0.dll
|
||||
0x000007fef40d0000 - 0x000007fef40d5000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-math-l1-1-0.dll
|
||||
0x000007feef040000 - 0x000007feef045000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-multibyte-l1-1-0.dll
|
||||
0x000007fef3ce0000 - 0x000007fef3ce3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-time-l1-1-0.dll
|
||||
0x000007fef40c0000 - 0x000007fef40c3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-filesystem-l1-1-0.dll
|
||||
0x000007fef40f0000 - 0x000007fef40f3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-environment-l1-1-0.dll
|
||||
0x000007fef40e0000 - 0x000007fef40e3000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\api-ms-win-crt-utility-l1-1-0.dll
|
||||
0x000007fee4360000 - 0x000007fee4e16000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\server\jvm.dll
|
||||
0x000007feff590000 - 0x000007feff66b000 C:\Windows\system32\ADVAPI32.dll
|
||||
0x000007fefe740000 - 0x000007fefe75f000 C:\Windows\SYSTEM32\sechost.dll
|
||||
0x000007fefe0e0000 - 0x000007fefe20c000 C:\Windows\system32\RPCRT4.dll
|
||||
0x000007fef5e30000 - 0x000007fef5e39000 C:\Windows\system32\WSOCK32.dll
|
||||
0x000007feff510000 - 0x000007feff55d000 C:\Windows\system32\WS2_32.dll
|
||||
0x000007feff770000 - 0x000007feff778000 C:\Windows\system32\NSI.dll
|
||||
0x000007fef66f0000 - 0x000007fef672b000 C:\Windows\system32\WINMM.dll
|
||||
0x000007fefc300000 - 0x000007fefc30c000 C:\Windows\system32\VERSION.dll
|
||||
0x00000000778e0000 - 0x00000000778e7000 C:\Windows\system32\PSAPI.DLL
|
||||
0x000007fef3cc0000 - 0x000007fef3cd1000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\verify.dll
|
||||
0x000007fefac50000 - 0x000007fefad75000 C:\Windows\system32\DBGHELP.DLL
|
||||
0x000007feef130000 - 0x000007feef159000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\java.dll
|
||||
0x000007fef3ca0000 - 0x000007fef3cb7000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\zip.dll
|
||||
0x000007fef3c00000 - 0x000007fef3c0b000 E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\jimage.dll
|
||||
|
||||
dbghelp: loaded successfully - version: 4.0.5 - missing functions: none
|
||||
symbol engine: initialized successfully - sym options: 0x614 - pdb path: .;E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin;C:\Windows\SYSTEM32;C:\Windows\WinSxS\amd64_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.24440_none_e36f1bbf30ff0606;E:\software\python\PyCharm Community Edition 2019.1.1\jre64\bin\server
|
||||
|
||||
VM Arguments:
|
||||
java_command: org.jetbrains.git4idea.http.GitAskPassApp Username for 'https://github.com':
|
||||
java_class_path (initial): E:/software/python/PyCharm Community Edition 2019.1.1/plugins/git4idea/lib/git4idea-rt.jar;E:/software/python/PyCharm Community Edition 2019.1.1/lib/xmlrpc-2.0.1.jar;E:/software/python/PyCharm Community Edition 2019.1.1/lib/commons-codec-1.10.jar;E:/software/python/PyCharm Community Edition 2019.1.1/lib/util.jar
|
||||
Launcher Type: SUN_STANDARD
|
||||
|
||||
[Global flags]
|
||||
intx CICompilerCount = 4 {product} {ergonomic}
|
||||
uint ConcGCThreads = 2 {product} {ergonomic}
|
||||
uint G1ConcRefinementThreads = 8 {product} {ergonomic}
|
||||
size_t G1HeapRegionSize = 1048576 {product} {ergonomic}
|
||||
uintx GCDrainStackTargetSize = 64 {product} {ergonomic}
|
||||
size_t InitialHeapSize = 134217728 {product} {ergonomic}
|
||||
size_t MarkStackSize = 4194304 {product} {ergonomic}
|
||||
size_t MaxHeapSize = 2124414976 {product} {ergonomic}
|
||||
size_t MinHeapDeltaBytes = 1048576 {product} {ergonomic}
|
||||
uintx NonNMethodCodeHeapSize = 5835340 {pd product} {ergonomic}
|
||||
uintx NonProfiledCodeHeapSize = 122911450 {pd product} {ergonomic}
|
||||
uintx ProfiledCodeHeapSize = 122911450 {pd product} {ergonomic}
|
||||
uintx ReservedCodeCacheSize = 251658240 {pd product} {ergonomic}
|
||||
bool SegmentedCodeCache = true {product} {ergonomic}
|
||||
bool UseCompressedClassPointers = true {lp64_product} {ergonomic}
|
||||
bool UseCompressedOops = true {lp64_product} {ergonomic}
|
||||
bool UseG1GC = true {product} {ergonomic}
|
||||
bool UseLargePagesIndividualAllocation = false {pd product} {ergonomic}
|
||||
|
||||
Logging:
|
||||
Log output configuration:
|
||||
#0: stdout all=warning uptime,level,tags
|
||||
#1: stderr all=off uptime,level,tags
|
||||
|
||||
Environment Variables:
|
||||
PATH=E:/software/Git/mingw64/libexec/git-core;E:/software/Git/mingw64/libexec/git-core;E:\software\Git\mingw64\bin;E:\software\Git\usr\bin;C:\Users\Administrator\bin;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;E:\software\Git\cmd;E:\software\MATLAB\runtime\win64;E:\software\MATLAB\bin;E:\software\Anaconda3.5;E:\software\Anaconda3.5\Library\bin;E:\software\Anaconda3.5\Scripts;C:\Users\Administrator\AppData\Local\Programs\Python\Python37\Scripts\;C:\Users\Administrator\AppData\Local\Programs\Python\Python37\;E:\software\python\PyCharm Community Edition 2019.1.1\bin;C:\Users\Administrator\AppData\Local\GitHubDesktop\bin
|
||||
USERNAME=Administrator
|
||||
DISPLAY=:0.0
|
||||
OS=Windows_NT
|
||||
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 94 Stepping 3, GenuineIntel
|
||||
|
||||
|
||||
|
||||
--------------- S Y S T E M ---------------
|
||||
|
||||
OS: Windows 7 , 64 bit Build 7601 (6.1.7601.24441)
|
||||
|
||||
CPU:total 8 (initial active 8) (4 cores per cpu, 2 threads per core) family 6 model 94 stepping 3, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, avx, avx2, aes, clmul, erms, rtm, 3dnowpref, lzcnt, ht, tsc, tscinvbit, bmi1, bmi2, adx, fma
|
||||
|
||||
Memory: 4k page, system-wide physical 8099M (695M free)
|
||||
TotalPageFile size 10145M (AvailPageFile size 121M)
|
||||
current process WorkingSet (physical memory assigned to process): 11M, peak: 11M
|
||||
current process commit charge ("private bytes"): 66M, peak: 193M
|
||||
|
||||
vm_info: OpenJDK 64-Bit Server VM (11.0.2+9-b159.34) for windows-amd64 JRE (11.0.2+9-b159.34), built on Mar 26 2019 11:55:29 by "" with MS VC++ 14.0 (VS2015)
|
||||
|
||||
END.
|
||||
@ -1,53 +1,14 @@
|
||||
from __future__ import print_function
|
||||
import torch
|
||||
# x = torch.empty(5, 3)
|
||||
# print(x)
|
||||
#
|
||||
# x = torch.rand(5, 3)
|
||||
# print(x)
|
||||
#
|
||||
# x = torch.zeros(5, 3, dtype=torch.long)
|
||||
# print(x)
|
||||
#
|
||||
# x = torch.tensor([5.5, 3])
|
||||
# print(x)
|
||||
#
|
||||
# x = x.new_ones(5, 3, dtype=torch.double)
|
||||
# print(x)
|
||||
# x = torch.randn_like(x, dtype=torch.float)
|
||||
# # 重写了数据类型
|
||||
# print(x)
|
||||
# # 结果大小相同
|
||||
# #
|
||||
# print(x.size())
|
||||
# #
|
||||
# y = torch.rand(5, 3)
|
||||
# # #加法方式1
|
||||
# print(x + y)
|
||||
# # #加法方式2
|
||||
# # #print(torch.add(x, y))
|
||||
# #
|
||||
# print(x[:,1])
|
||||
|
||||
# x = torch.randn(4, 4)
|
||||
# y = x.view(16)
|
||||
# z = x.view(-1, 8) # the size -1 is inferred from other dimensions
|
||||
# print(x.size(), y.size(), z.size())
|
||||
|
||||
# x = torch.randn(1)
|
||||
# print(x)
|
||||
# print(x.item())
|
||||
x = torch.randn((3), dtype=torch.float32, requires_grad=True)
|
||||
y = torch.randn((3), dtype=torch.float32, requires_grad=True)
|
||||
z = torch.randn((3), dtype=torch.float32, requires_grad=True)
|
||||
t = x + y
|
||||
loss = t.dot(z) # 求向量的内积
|
||||
|
||||
# x = torch.rand(5, 3)
|
||||
# print(x)
|
||||
# x[0,1] = 100
|
||||
# print(x)
|
||||
x = torch.randn(2, 3)
|
||||
print(x)
|
||||
|
||||
y = torch.randn(3)
|
||||
print(y)
|
||||
|
||||
# 被传入的参数中的第1个参数代表矩阵，第2个参数代表向量，顺序不能颠倒。
|
||||
z = torch.mv(x, y)
|
||||
print(z)
|
||||
loss.backward(retain_graph=True)
|
||||
print(z, x.grad, y.grad) # 预期打印出的结果都一样
|
||||
print(t, z.grad) # 预期打印出的结果都一样
|
||||
print(t.grad)
|
||||
Reference in New Issue
Block a user