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The error arises because tensorflow cannot determine the tensor shapes explicitly. When using tf.data.Dataset.from_generator, you should provide an output_signature argument to explicitly define the shape and type of the output tensors. This allows tensorflow to properly handle the data.

Instead of using this:

ds = tf.data.Dataset.from_generator(generator, 
                        output_types=({'LoB': tf.int32}, tf.float32))

Use this:

ds = tf.data.Dataset.from_generator(generator, output_signature=(
    {'LoB': tf.TensorSpec(shape=(1,), dtype=tf.int32)},
    tf.TensorSpec(shape=(1,), dtype=tf.float32)
))

please refer to this document for more details.

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