ptp/components/models/vision/lenet5.py
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) IBM Corporation 2019
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
__author__ = "Tomasz Kornuta & Vincent Marois"
import torch
from ptp.components.models.model import Model
from ptp.data_types.data_definition import DataDefinition
class LeNet5(Model):
"""
A classical LeNet-5 model for MNIST digits classification.
"""
def __init__(self, name, config):
"""
Initializes the ``LeNet5`` model, creates the required layers.
:param name: Name of the model (taken from the configuration file).
:param config: Parameters read from configuration file.
:type config: ``ptp.configuration.ConfigInterface``
"""
super(LeNet5, self).__init__(name, LeNet5, config)
# Get key mappings.
self.key_inputs = self.stream_keys["inputs"]
self.key_predictions = self.stream_keys["predictions"]
# Retrieve prediction size from globals.
self.prediction_size = self.globals["prediction_size"]
# Create the LeNet-5 layers.
self.conv1 = torch.nn.Conv2d(1, 6, kernel_size=(5, 5))
self.maxpool1 = torch.nn.MaxPool2d(kernel_size=(2, 2), stride=2)
self.conv2 = torch.nn.Conv2d(6, 16, kernel_size=(5, 5))
self.maxpool2 = torch.nn.MaxPool2d(kernel_size=(2, 2), stride=2)
self.conv3 = torch.nn.Conv2d(16, 120, kernel_size=(5, 5))
self.linear1 = torch.nn.Linear(120, 84)
self.linear2 = torch.nn.Linear(84, self.prediction_size)
def input_data_definitions(self):
"""
Function returns a dictionary with definitions of input data that are required by the component.
:return: dictionary containing input data definitions (each of type :py:class:`ptp.utils.DataDefinition`).
"""
return {
self.key_inputs: DataDefinition([-1, 1, 32, 32], [torch.Tensor], "Batch of images [BATCH_SIZE x IMAGE_DEPTH x IMAGE_HEIGHT x IMAGE WIDTH]"),
}
def output_data_definitions(self):
"""
Function returns a dictionary with definitions of output data produced the component.
:return: dictionary containing output data definitions (each of type :py:class:`ptp.utils.DataDefinition`).
"""
return {
self.key_predictions: DataDefinition([-1, self.prediction_size], [torch.Tensor], "Batch of predictions, each represented as probability distribution over classes [BATCH_SIZE x PREDICTION_SIZE]")
}
def forward(self, data_streams):
"""
Main forward pass of the ``LeNet5`` model.
:param data_streams: DataStreams({'images',**}), where:
- images: [batch_size, num_channels, width, height]
:type data_streams: ``miprometheus.utils.DataStreams``
:return: Predictions [batch_size, num_classes]
"""
# Add noise to weights
#for _, param in self.named_parameters():
# if param.requires_grad:
# #print (name, param.data)
# #noise = -torch.randn(param.data.shape)*0.3
# noise = 0.3
# param.data = param.data * (1 + noise)
# #print (name, param.data)
# Unpack DataStreams.
img = data_streams[self.key_inputs]
# Pass inputs through layers.
x = self.conv1(img)
x = torch.nn.functional.relu(x)
x = self.maxpool1(x)
x = self.conv2(x)
x = torch.nn.functional.relu(x)
x = self.maxpool2(x)
x = self.conv3(x)
x = torch.nn.functional.relu(x)
x = x.view(-1, 120)
x = self.linear1(x)
x = torch.nn.functional.relu(x)
x = self.linear2(x)
# Log softmax.
predictions = torch.nn.functional.log_softmax(x, dim=1)
# Add predictions to datadict.
data_streams.publish({self.key_predictions: predictions})