mindspore.ops.Real fails on empty complex tensors with CPU CreateKernel RuntimeError

[tingPetty]

mindspore.ops.Real fails on empty complex tensors in MindSpore 2.8.0 (CPU, Windows). Runtime reports kernel init failure (it got empty inputs or outputs, which is invalid) and CreateKernel RuntimeError. Equivalent PyTorch torch.real succeeds and returns empty output.

Environment

Hardware Environment(Ascend/GPU/CPU):

/device cpu

Software Environment:

• MindSpore version (source or binary): 2.8.0 (binary, pip in conda env)
• Python version (e.g., Python 3.7.5): 3.10.18
• OS platform and distribution (e.g., Linux Ubuntu 16.04): Windows 10 (10.0.26200)
• GCC/Compiler version (if compiled from source): N/A (not compiled from source)

Describe the current behavior

ops.Real()(x) with x.shape=(2, 0, 3, 1), dtype=complex128 fails in MindSpore and throws RuntimeError with CreateKernel call stack.

Describe the expected behavior

• Return empty output tensor with correct shape/dtype, or
• Raise clear user-facing validation error (if empty tensors are unsupported), without internal CreateKernel failure.

Steps to reproduce the issue

1. Save and run:

import numpy as np
import torch
import mindspore as ms
from mindspore import ops

print("mindspore:", ms.__version__)
print("torch:", torch.__version__)

x_ms = ms.Tensor(np.empty((2, 0, 3, 1), dtype=np.complex128))
try:
    y_ms = ops.Real()(x_ms)
    print("MindSpore success:", y_ms.shape, y_ms.dtype)
except Exception as e:
    print("MindSpore failed:", type(e).__name__)
    print(e)

x_t = torch.complex(
    torch.empty((2, 0, 3, 1), dtype=torch.float64),
    torch.empty((2, 0, 3, 1), dtype=torch.float64),
)
y_t = torch.real(x_t)
print("PyTorch success:", y_t.shape, y_t.dtype)

2. Observe MindSpore RuntimeError and CreateKernel stack.
3. Observe PyTorch succeeds.

Related log / screenshot

Representative log:

[ERROR] ... UnaryOpCpuKernelMod::Init] For 'Real', it got empty inputs or outputs, which is invalid.
RuntimeError:
- C++ Call Stack:
mindspore\ccsrc\plugin\cpu\cpu_device_context.cc:543 mindspore::device::cpu::CPUKernelExecutor::CreateKernel