Fix dimension error in static mode.

[KPatr1ck]

PR types

Bug fixes

PR changes

APIs

Describe

paddle.signal.stft静态图计算结果shape有误

import paddle
from paddle.signal import stft
import numpy as np
import torch

# n_fft = 4
# print(n_fft//4)
# x_data = np.arange(4).astype('float64')
x_data = np.random.rand(4, )
# x_data = np.exp(3j * np.pi * np.arange(7) / 7)
x = paddle.to_tensor(x_data)
y1 = stft(x, 4, onesided=False)
print(y1)

paddle.enable_static()
main_program, startup_program = paddle.static.Program(), paddle.static.Program()
with paddle.utils.unique_name.guard():
    with paddle.static.program_guard(main_program=main_program, startup_program=startup_program):
        data0 = paddle.static.data(name='s0', shape=(4, ), dtype="float64")
        feed = {"s0": x_data}
        out = stft(data0, 4, onesided=False)
        exe = paddle.static.Executor()
        exe.run(startup_program)
        static_res = exe.run(main_program, feed=feed, fetch_list=[out])
paddle.disable_static()
print(static_res[0].shape)

文档描述有误：

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