reshape.cc:55 stretch_dim != -1. Node number X (RESHAPE) failed to prepare

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I'm new to all this, and I need some help with running inference using a custom tflite yolov3 tiny model. The error I am getting is:

File "/usr/local/lib/python3.6/dist-packages/tensorflow/lite/python/interpreter.py", line 524, in invoke
    self._interpreter.Invoke()
RuntimeError: tensorflow/lite/kernels/reshape.cc:55 stretch_dim != -1 (0 != -1)Node number 35 (RESHAPE) failed to prepare.

What have I done to get here:

  1. trained a custom yolov3 tiny model for object detection to detect just 1 class using this project https://github.com/pythonlessons/TensorFlow-2.x-YOLOv3.git
  2. used default hyperparameters: https://github.com/pythonlessons/TensorFlow-2.x-YOLOv3/blob/master/yolov3/configs.py
  3. used tf-nightly
  4. the model is here: https://github.com/vladimirhorvat/y/blob/master/app/src/main/assets/converted_model.tflite

When the model was trained I tested the SavedModel by running inference and it worked. Converted the SavedModel to tflite, run inference on it using the following code, and received the error from the title:

interpreter = tf.lite.Interpreter(model_path="converted_model.tflite")
interpreter.allocate_tensors()
input_details = interpreter.get_input_details()
input_shape = input_details[0]['shape']
input_data = np.array(np.random.random_sample(input_shape), dtype=np.float32)
interpreter.set_tensor(input_details[0]['index'], input_data)
interpreter.invoke()

(this code is from here, btw https://www.tensorflow.org/lite/guide/inference#load_and_run_a_model_in_python )

Data for node 35:

type: Reshape
location: 35
inputs
    data: name: functional_1/tf_op_layer_Tile_3/Tile_3;StatefulPartitionedCall/functional_1/tf_op_layer_Tile_3/Tile_3
    shape: name: functional_1/tf_op_layer_strided_slice_6/strided_slice_6;StatefulPartitionedCall/functional_1/tf_op_layer_strided_slice_6/strided_slice_6
outputs
    reshaped: name: functional_1/tf_op_layer_strided_slice_16/strided_slice_16;StatefulPartitionedCall/functional_1/tf_op_layer_strided_slice_16/strided_slice_16

Please help. I am out of ideas.

yolo tensorflow2.0 tensorflow python
1 Answers

I was able to solve the exact same problem by following this similar post: https://stackoverflow.com/a/62552677/11334316

In essence you would have to do the following when converting your model:

batch_size = 1
model = tf.keras.models.load_model('./yolo_model')
input_shape = model.inputs[0].shape.as_list()
input_shape[0] = batch_size
func = tf.function(model).get_concrete_function(tf.TensorSpec(input_shape, model.inputs[0].dtype))
model_converter = tf.lite.TFLiteConverter.from_concrete_functions([func])
model_lite = model_converter.convert()
f = open("./yolo_model.tflite", "wb")
f.write(model_lite)
f.close()
user_113343160
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