mindspore.nn.Cell.get_inputs() 返回值为 null

[Hsiayukoo]

Environment

Hardware Environment(Ascend/GPU/CPU):

/device ascend

Software Environment:

• MindSpore version (source or binary):2.3.1
• Python version (e.g., Python 3.7.5):3.9
• OS platform and distribution (e.g., Linux Ubuntu 16.04):euler
• GCC/Compiler version (if compiled from source):

Describe the current behavior

相同的 mindir 文件，mindspore_lite 和 mindspore 比较，mindspore 无法获取正确信息。

Describe the expected behavior

首先是 mindspore 框架读取 mindir 数据

import mindspore as ms
from mindspore import nn
graph = ms.load("output.mindir")
net = nn.GraphCell(graph)
print(net.get_inputs())
>>> None

其次是 mindspore_lite 读取 mindir 数据

import numpy as np
import mindspore_lite as mslite

context = mslite.Context()
context.target = ["cpu"]
context.cpu.thread_num = 1
context.cpu.thread_affinity_mode = 2

model = mslite.Model()
model.build_from_file("output.mindir", mslite.ModelType.MINDIR, context)

print(model.get_inputs()[0])
>>> name: x
>>> ...
>>> shape: [1, 3, 720, 1280]

相比之下，mindspore_lite 成功读取了输入的 shape，而 mindspore 读取为 None。从源码来看，似乎 mindspore.nn.Cell.get_inputs() 只有在 set_inputs() 之后才能读取，通过 net = nn.GraphCell(graph) 并不会读取 mindir 中的 input_shape 进行初始化 Cell 的 _dynamic_shape_inputs 属性。不知道这是设计本身就这样，还是一个 bug。

Related log / screenshot

mindir 文件对应的地址为 https://github.com/mindspore-lab/mindocr/blob/main/configs/det/east/README_CN.md 中的 https://download.mindspore.cn/toolkits/mindocr/east/east_resnet50_ic15-7262e359-5f05cd42.mindir

Special notes for this issue