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visualize_episodes.py
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visualize_episodes.py
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import os
import numpy as np
import cv2
import h5py
import argparse
import matplotlib.pyplot as plt
from constants import DT
import IPython
e = IPython.embed
JOINT_NAMES = ["waist", "shoulder", "elbow", "forearm_roll", "wrist_angle", "wrist_rotate"]
STATE_NAMES = JOINT_NAMES + ["gripper"]
def load_hdf5(dataset_dir, dataset_name):
dataset_path = os.path.join(dataset_dir, dataset_name + '.hdf5')
if not os.path.isfile(dataset_path):
print(f'Dataset does not exist at \n{dataset_path}\n')
exit()
with h5py.File(dataset_path, 'r') as root:
is_sim = root.attrs['sim']
qpos = root['/observations/qpos'][()]
qvel = root['/observations/qvel'][()]
effort = root['/observations/effort'][()]
action = root['/action'][()]
image_dict = dict()
for cam_name in root[f'/observations/images/'].keys():
image_dict[cam_name] = root[f'/observations/images/{cam_name}'][()]
return qpos, qvel, effort, action, image_dict
def main(args):
dataset_dir = args['dataset_dir']
episode_idx = args['episode_idx']
dataset_name = f'episode_{episode_idx}'
qpos, qvel, effort, action, image_dict = load_hdf5(dataset_dir, dataset_name)
save_videos(image_dict, DT, video_path=os.path.join(dataset_dir, dataset_name + '_video.mp4'))
visualize_joints(qpos, action, plot_path=os.path.join(dataset_dir, dataset_name + '_qpos.png'))
visualize_single(effort, 'effort', plot_path=os.path.join(dataset_dir, dataset_name + '_effort.png'))
visualize_single(action - qpos, 'tracking_error', plot_path=os.path.join(dataset_dir, dataset_name + '_error.png'))
# visualize_timestamp(t_list, dataset_path) # TODO addn timestamp back
def save_videos(video, dt, video_path=None):
if isinstance(video, list):
cam_names = list(video[0].keys())
h, w, _ = video[0][cam_names[0]].shape
w = w * len(cam_names)
fps = int(1/dt)
out = cv2.VideoWriter(video_path, cv2.VideoWriter_fourcc(*'mp4v'), fps, (w, h))
for ts, image_dict in enumerate(video):
images = []
for cam_name in cam_names:
image = image_dict[cam_name]
image = image[:, :, [2, 1, 0]] # swap B and R channel
images.append(image)
images = np.concatenate(images, axis=1)
out.write(images)
out.release()
print(f'Saved video to: {video_path}')
elif isinstance(video, dict):
cam_names = list(video.keys())
all_cam_videos = []
for cam_name in cam_names:
all_cam_videos.append(video[cam_name])
all_cam_videos = np.concatenate(all_cam_videos, axis=2) # width dimension
n_frames, h, w, _ = all_cam_videos.shape
fps = int(1 / dt)
out = cv2.VideoWriter(video_path, cv2.VideoWriter_fourcc(*'mp4v'), fps, (w, h))
for t in range(n_frames):
image = all_cam_videos[t]
image = image[:, :, [2, 1, 0]] # swap B and R channel
out.write(image)
out.release()
print(f'Saved video to: {video_path}')
def visualize_joints(qpos_list, command_list, plot_path=None, ylim=None, label_overwrite=None):
if label_overwrite:
label1, label2 = label_overwrite
else:
label1, label2 = 'State', 'Command'
qpos = np.array(qpos_list) # ts, dim
command = np.array(command_list)
num_ts, num_dim = qpos.shape
h, w = 2, num_dim
num_figs = num_dim
fig, axs = plt.subplots(num_figs, 1, figsize=(w, h * num_figs))
# plot joint state
all_names = [name + '_left' for name in STATE_NAMES] + [name + '_right' for name in STATE_NAMES]
for dim_idx in range(num_dim):
ax = axs[dim_idx]
ax.plot(qpos[:, dim_idx], label=label1)
ax.set_title(f'Joint {dim_idx}: {all_names[dim_idx]}')
ax.legend()
# plot arm command
for dim_idx in range(num_dim):
ax = axs[dim_idx]
ax.plot(command[:, dim_idx], label=label2)
ax.legend()
if ylim:
for dim_idx in range(num_dim):
ax = axs[dim_idx]
ax.set_ylim(ylim)
plt.tight_layout()
plt.savefig(plot_path)
print(f'Saved qpos plot to: {plot_path}')
plt.close()
def visualize_single(efforts_list, label, plot_path=None, ylim=None, label_overwrite=None):
efforts = np.array(efforts_list) # ts, dim
num_ts, num_dim = efforts.shape
h, w = 2, num_dim
num_figs = num_dim
fig, axs = plt.subplots(num_figs, 1, figsize=(w, h * num_figs))
# plot joint state
all_names = [name + '_left' for name in STATE_NAMES] + [name + '_right' for name in STATE_NAMES]
for dim_idx in range(num_dim):
ax = axs[dim_idx]
ax.plot(efforts[:, dim_idx], label=label)
ax.set_title(f'Joint {dim_idx}: {all_names[dim_idx]}')
ax.legend()
if ylim:
for dim_idx in range(num_dim):
ax = axs[dim_idx]
ax.set_ylim(ylim)
plt.tight_layout()
plt.savefig(plot_path)
print(f'Saved effort plot to: {plot_path}')
plt.close()
def visualize_timestamp(t_list, dataset_path):
plot_path = dataset_path.replace('.pkl', '_timestamp.png')
h, w = 4, 10
fig, axs = plt.subplots(2, 1, figsize=(w, h*2))
# process t_list
t_float = []
for secs, nsecs in t_list:
t_float.append(secs + nsecs * 10E-10)
t_float = np.array(t_float)
ax = axs[0]
ax.plot(np.arange(len(t_float)), t_float)
ax.set_title(f'Camera frame timestamps')
ax.set_xlabel('timestep')
ax.set_ylabel('time (sec)')
ax = axs[1]
ax.plot(np.arange(len(t_float)-1), t_float[:-1] - t_float[1:])
ax.set_title(f'dt')
ax.set_xlabel('timestep')
ax.set_ylabel('time (sec)')
plt.tight_layout()
plt.savefig(plot_path)
print(f'Saved timestamp plot to: {plot_path}')
plt.close()
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--dataset_dir', action='store', type=str, help='Dataset dir.', required=True)
parser.add_argument('--episode_idx', action='store', type=int, help='Episode index.', required=False)
main(vars(parser.parse_args()))