训练数字识别的神经网络，tf库的函数好像都会报这个错误，用的openmv4 H7 plus，固件版本4.7.0，为什么？

[2dgr]

![0_1751559431072_屏幕截图 2025-07-04 000943.png](https://fcdn.singtown.com/47d8c402-9d04-4bd7-8f1a-50ae0f1304b3.png) 

import sensor, image, time, os, tf

sensor.reset()                         # Reset and initialize the sensor.
sensor.set_pixformat(sensor.GRAYSCALE)    # Set pixel format to RGB565 (or GRAYSCALE)
sensor.set_framesize(sensor.QVGA)      # Set frame size to QVGA (320x240)
sensor.set_windowing((240, 240))       # Set 240x240 window.
sensor.skip_frames(time=2000)          # Let the camera adjust.

clock = time.clock()
while(True):
    clock.tick()
    img = sensor.snapshot().binary([(0,64)])
    for obj in tf.classify("trained.tflite", img, min_scale=1.0, scale_mul=0.5, x_overlap=0.0, y_overlap=0.0):
        output = obj.output()
        number = output.index(max(output))
        print(number)

[avqs]

4.5.5固件版本以上就不支持tf库了，神经网络用的是ml库