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1# Copyright (c) 2021 Arm Limited.
2#
3# SPDX-License-Identifier: MIT
4#
5# Permission is hereby granted, free of charge, to any person obtaining a copy
6# of this software and associated documentation files (the "Software"), to
7# deal in the Software without restriction, including without limitation the
8# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9# sell copies of the Software, and to permit persons to whom the Software is
10# furnished to do so, subject to the following conditions:
11#
12# The above copyright notice and this permission notice shall be included in all
13# copies or substantial portions of the Software.
14#
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21# SOFTWARE.
22import logging
23import os
24
25
26def is_tflite_model(model_path):
27    """Check if a model is of TFLite type
28
29    Parameters:
30    ----------
31    model_path: str
32        Path to model
33
34    Returns
35    ----------
36    bool:
37        True if given path is a valid TFLite model
38    """
39
40    try:
41        with open(model_path, "rb") as f:
42            hdr_bytes = f.read(8)
43            hdr_str = hdr_bytes[4:].decode("utf-8")
44            if hdr_str == "TFL3":
45                return True
46            else:
47                return False
48    except:
49        return False
50
51
52def identify_model_type(model_path):
53    """Identify the type of a given deep learning model
54
55    Parameters:
56    ----------
57    model_path: str
58        Path to model
59
60    Returns
61    ----------
62    model_type: str
63        String representation of model type or 'None' if type could not be retrieved.
64    """
65
66    if not os.path.exists(model_path):
67        logging.warn(f"Provided model {model_path} does not exist!")
68        return None
69
70    if is_tflite_model(model_path):
71        model_type = "tflite"
72    else:
73        logging.warn(logging.warn(f"Provided model {model_path} is not of supported type!"))
74        model_type = None
75
76    return model_type
77