can not parse a correct protxt

[xiwei777]

'''
op_name: "reduce_tensor"
input {
id: "a"
shape: {
dims: 50
dims: 32
dims: 768
dims: 1
}
layout: LAYOUT_NCHW
dtype: DTYPE_FLOAT
ttype: TENSOR
random_data: {
seed: 233
distribution: UNIFORM
upper_bound: 10
lower_bound: -10
}
}
output {
id: "c"
shape: {
dims: 1
dims: 1
dims: 768
dims: 1
}
layout: LAYOUT_NCHW
dtype: DTYPE_FLOAT
ttype: TENSOR
random_data: {
seed: 233
distribution: UNIFORM
upper_bound: 10
lower_bound: -10
}
}
reduce_tensor {
reduce_tensor_param {
op: 0
data type: 0
nanOpt: 1
indices mode: 0
indices type: 0
alpha: 1.000000
beta: 0.000000
workspace size: 4915200
}
}
'''