Build with nn.Sequential

Problem Statement

Build a neural network using the nn.Sequential container.

Background

nn.Sequential is a convenient container for building simple feed-forward networks. Modules are added in order, and each module's output is automatically passed as input to the next.

Your Task

Write a function build_sequential_net(input_size, hidden_size, output_size) that builds a two-layer network with a ReLU activation between them and returns a dictionary describing it.

Output Format

Return a dictionary with keys: "num_layers" (int), "output_shape" (list — shape for a single sample), "has_relu" (boolean).