"Failed to read vector from stream. : Expected token FV, got W"

[matthewkperez]

Hello,
I'm getting an error when attempting to use copy-vector on the output of 'kaldi_io.write_vec_int'.

Error is: "Failed to read vector from stream. : Expected token FV, got W"

Goal: I have a large text file of kaldi features. The file is in .ark format however the contents are in human-readable form which I converted using 'copy-feats ark:- ark,t:-'. I want to create multiple small files where each file contains a key and mat pair. To do this I am reading in the ark file using kaldi_io and attempting to write a new file using kaldi_io within the kaldi_io.read_vec_int_ark loop. I am able to successfully read key and mat from the file, but an error occurs when attempting to write.

Code:
`for key, mat in kaldi_io.read_vec_int_ark(sfile):
print("{} {}".format(key,mat.shape))

        ## create new file to write to
        new_file_path_txt = os.path.join(sdir, "{}.{}".format(key, file_tail))
        new_file_path = os.path.join(sdir, "{}.ark".format(key))
        # new_file_path_txt = os.path.join(sdir, "{}.txt".format(key))

        # Write new file
        print("type: {}".format(type(mat)))
        print("dtype: {}".format(mat.dtype))
        mat = mat.astype('int32') # need to cast for writing purposes
        print("dtype2: {}".format(mat.dtype))

        ark_txt_output = 'ark:| copy-vector ark:- ark,t:{}'.format(new_file_path_txt)
        with kaldi_io.open_or_fd(ark_txt_output, 'wb') as w:
            kaldi_io.write_vec_int(w, mat, key=key)`