Code style of the gru_op related should be formatted

[guoshengCS]

The code style of the gru_op related, mainly the variable names like batchSize, should be formatted and unified with other code.

[guoshengCS]

The python code to convert variable names from varName to var_name in the given file is as follows:

import sys
import re

reg_expr = r"([^a-zA-Z_0-9])([a-z]+)(([A-Z][a-z]+)+)"
sub_reg_expr = r"[A-Z][a-z]+"
filt_names = ["blockIdx", "blockDim", "threadIdx"]

def revise_code_style(str):
    vars = []
    # find the matched variable names and construct the new names
    for rs in re.finditer(reg_expr, str):
        if rs.group(2) + rs.group(3) in filt_names:
            continue
        new_name = rs.group(1) + rs.group(2)
        for sub_rs in re.finditer(sub_reg_expr, str[rs.span(3)[0]:rs.span(3)[1]]):
            new_name += "_" + sub_rs.group().lower()
        vars.append((rs.span(), new_name))
    # replace with the formatted variable names
    new_str = str[vars[-1][0][1]:] if vars else str
    for i in range(len(vars))[::-1]:
        new_str = vars[i][1] + new_str
        new_str = (str[vars[i-1][0][1]:vars[i][0][0]] if i > 0 else str[:vars[i][0][0]]) + new_str
    return new_str

def revise_file_code_sytle(file_name):
    with open(file_name) as f:
        code = f.read()
        new_code = revise_code_style(code)
    with open(file_name + "_new", "w") as f:
        f.write(new_code)

revise_file_code_sytle(sys.argv[1])